This one is similar to one of the previous paragraphs that talked about physical aggression. If your partner is always trying to force you when it comes to having sex and all related issues, that could be a serious red flag when it comes to the state of your relationship. While some people do enjoy having rough sex, there is a big difference between that, and forcing someone into having sex.
If you feel that your partner is coercing you into intercourse, then you should most definitely talk about this with him, and make it known that you want to end that behavior immediately. In any case, in situations like this, you need to be prepared to leave the relationship, as people that force others into having sex aren't really the kind that changes their behavior after having a talk.