Why don't you write smut?
There are like three answers to this, so here you go.
1. While I have no problem reading it, I can’t take it seriously when I try to write it. The words sound so cheesy to me and I’m just like, uh… no. To be honest, I haven’t tried to write smut since I wrote fics for Glee, but I’ve just never been able to do it.
2. I feel like you need to have some experience to be able to write it properly. Back when I was in the Glee fandom, you could tell right away who had never actually had sex before. Now, I’m not saying it has to be this way for everyone. I’m sure there are some people who can write it even if they haven’t experienced it, but I can’t. I’ve never even had my first kiss, but that one’s not as difficult to write as good smut.
3. I actually get quite a few people who write me telling me they’re happy I don’t write smut. I always thought it would hold me back from getting a lot of reviews or a lot of people reading, and maybe it has, but I haven’t really noticed it. Some people are very uncomfortable with smut in fics, and I’m glad I can be a place they can come to and read a “romantic” fic without being uncomfortable.