Sex is important to most organisms. I don't think people want sex just because it's a norm in society. I think they want it due to an instinctive desire. Just like people want to eat food and breathe air.
Yeah, I worded my comment poorly. I can easily understand why someone would want to have sex. I just don't understand why someone would be afraid of not wanting to have sex.
I guess it's personal to different people. Some people don't care about sex and that's fine. Some people want sex, and as long as they do it in an ethical way (e.g. not sexually abusing anybody), that's fine too.
If sex does matter to someone then they might not want to lose that part of themselves. Just like, if you have a certain hobby, you might think "I hope I maintain my interest in this hobby, because it's a key part of who I am".
