I rarely have my character's use a condom: but that's because, as mentioned: I have an impregnation fetish. Furthermore, honestly, if you're not at a point in a relationship where you feel comfortable with the idea of siring/bearing your partner's child: you shouldn't be having sex. (Well, at least not sex that can potentially result in pregnancy, and the only 100% reliable form of birth control is not engaging in that specific form of sexual contact... There are other options if you both feel you are not ready for children: anal, cunnilingus, fellatio, mutual masturbation, 69...)