This research is a probabilistic and representative study, whose data have been analyzed by multivariate models, considering condom use and associated factors among adolescents. The population studied in this study was equivalent to 74% of all adolescents enrolled at secondary education in Cape Verde . As a main finding, there was a great frequency of condom use in the last sexual relationship, which may be a result of programs prevention. We believe that differential by religion and affective-sexual partner in condom use is due to the need of protective actions to non-Catholic religious.
In this research some new variables were measured, which we will discuss below. However, some important variables which might explain the conclusion of the study [9, 12] were not measured in this study. Another limitation of this research is the possible bias in the declaration related to gender expectations, that is, boys might have reported more experiences than girls . Also, we did not assess unwanted pregnancy cases.
The high prevalence of the use of condom at last sexual relationship obtained at the present study is similar to that presented by the research data on demography and reproductive health at the population of Cape Verde, especially in female adolescents between 15 and 19 years old [12, 14]. However, the prevalence found in the present research (94.9%) differs greatly in magnitude from those one obtained among juvenile population of Cape Verde (from 15 to 19 years old) [55.3%], and from the population of this age group in Santiago Island (48.4%) .
The low prevalence of estimated HIV in Cape Verde  (varying from 0.8% to 1.5% of the population) may be explained by the high frequency of the use of condom. However, although the prevalence of the epidemic in Cape Verde may be lower than in Sub-Saharan Africa countries, where the epidemic seems to have sustained (prevalence of 7.4% ), it is still a matter of concern for Cape Verdian public health.
Factors that may explain the frequency of the use of condom at last sexual relationship among adolescents of the island are: free distribution of condoms; the policy of cooperation with Brazil and Portugal regarding prevention; the treatment of sexually transmitted diseases (STDs) such as HIV/AIDS; and the implantation of the program of sexual and reproductive education in secondary schools.
According to similar national  and international [5, 17] studies it is revealed that the negotiation of the use of condom during the sexual act encounter obstacles based on social patterns: men usually present more power of decision than women. These obstacles, thus, are usually faced by women, more vulnerable and emotionally evolved than men. This sensitive characteristic of women shall contribute to the non-use of condom and consequently, their unprotected sex, facilitating the infection of STDs/AIDS.
The understanding of the differences between men and women regarding the use of the condom needs cautious analysis. The choices exercised by men and women in their sexual lives are associated with the existence of gender differences related to conceptions about affective-sexual connection . These conceptions are related to the need of protection , and are based on the difficulty of women in negotiating the use of condom. The status of the relationship also influences the choice of having sex with or without condom.
Our study corroborates the data of the studies discussed above, despite the evidences do not point to the vulnerability of women to the non-use of condom. However, the findings reinforce the association with the perception of greater risk for HIV or the previous occurrence of SDTs among female adolescents whose use of condom was less frequent.
Corroborating other studies in the literature,  we observed that religion and affective-sexual partner are important factors to be taken into consideration both in research and in the organization of prevention services and assistance. The distribution by religion coincides with that described in research projects on demography and reproductive health [13, 18]. In these studies, Roman Catholics use condom more frequently, and the frequency was stronger in girls than in boys, despite the absence of statistical significance.
Religious affiliation influenced the use of condom in sexual relations: Catholic adolescents reported more frequent use than did those of other religions. These findings are important for the planning of strategies related to the use of contraceptive methods. These strategies might avoid undesired pregnancies and STDs, including AIDS.
On the other hand, another Cape Verdean study with focus on qualitative characteristics of adolescent population did not report  any association between condom use and religious affiliation. Nonetheless, religious category did not distinguished creeds.
In the present study the use of the condom at last sexual relation was much more frequent among adolescents who had an affective-sexual partner in the period prior to the research. These evidences differ from those observed in studies from other countries [16, 19, 20]. The international literature pointed that condom was partially replaced by other methods, such as oral or injection hormonal contraceptive methods. This might be explained by the fact that they had replaced condom as their contraceptive method of choice, despite adolescents interviewed have begun their sexual life outside a stable union and at an earlier age. Adolescents substituted condom use precisely because they were involved in a more stable and affective relationship at that moment. This form of relationship confirms a tendency of non use of condom when the relationship becomes more stable. It might be a proof of love, confidence and fidelity to the partner. It also might be a consequence of a protection feeling and monogamous fidelity.
The data of the present study suggest that male adolescents begin their sexual life before female, and that condom increases safety on the protection against STDs/HIV as well as undesirable pregnancy [21, 22]. The asymmetries of sexual life beginning between men and women are based on differences of attitude, family and social expectancies in comparison to female and male conduct face to sexuality. Boys seem to be more stimulated to sexual initiation before marriage, while girls consider that this practice is not socially accepted .
Despite this study reinforces the idea of sexual life beginning at an earlier age, these evidences are opposite to what really happens in current life of adolescents from Cape Verde. In general these adolescents do not have adequate information . More than 90% knew some kind of contraceptive method from the total population studied here – a significant level of information about the more familiar forms of contraception -, and the majority knew that they should use condom.
In conclusion, we show a high prevalence of condom use in the last sexual relationship. This fact might be a consequence of official programs in STDs/AIDS prevention. On the other hand, results regarding condom use according to religion and affective-sexual partner reveal the necessity of preventive actions directed to non-Catholic religious segments and to those who do not have an affective-sexual partner.