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”.