Do I have to love sex?
Definitely not. I personally don’t enjoy sex that much (I strongly prefer masturbation). However, I have had partners that definitely changed the way I felt about sex simply because they were so good at it, so who knows? Maybe you just need the right person to show you a good time.
If you’re in a relationship though, and the sex isn’t great or you simply don’t enjoy sex in general, you definitely need to communicate that to your partner. If your partner isn’t the type to want to communicate with you about something you feel you need to talk about (and you definitely should communicate your sexual needs with each other), then they’re probably not a good match for you to begin with.
Everyone needs someone they’re compatible with in many different areas, but sex, I think, is one of the most important, even if your sexual needs are practically nonexistent. You need someone sexually compatible with you in order to have a well-functioning relationship.