It's normal for sex(orgasms) to bring on contractions. It's actually completely safe to have sex through out pregnancy unless your doctor says not to. It doesn't hurt you or your baby. How Ever if you aren't comfortable then don't let him bother you.
&& stop doing it if your feeling pain if your in pain your probably hurting yourself and the baby
Yea its normal and sounds like he doesn't care about you only his needs
Sex, and especially orgasm, can bring on labor in late pregnancy. Orgasm uses some of the same muscles as contractions. Time them and their intensity, and get to the hospital if you think you're in labor.