We therefore calculated Odds ratios adjusted for age, gender, educational level of father and level of religiosness for the different sexual behaviors of interest and for contraception use in females.

Looking at sexual behaviors as dependent variable in the logistic regression models we find, that compared to German students as the reference group Spanish students were less likely to have more than one sex partner within the last 12 months (OR 0.59),

They were also significantly less likely to have two or more times sexual intercourse per week (OR 0.66).

The most striking effect was found for a lower use of oral contraceptives (OR 0.16).

We also found a significantly elevated Odds ratio for condom use as contraceptive method among female students (OR 2.79) and for a consequent use of condoms with a new sex partner (OR 2.22) in Spanish students compared to German students.

Since these odds ratios were adjusted for age and other differences between the study groups we conclude that some unbiased differences in the sexual behaviors and contraception may exist between German and Spanish students.

This leads to the question whether these differences may be accompanied by differences in STD prevalence.