Opposite sex friendships
I saw this post and it reminded me of when I was younger. I was friends with women because I was insecure and felt I could not compete with other men. The problem is I'm straight and so when they anything other than hard lesbian, there are a lot of complicated boundary issues. Not just about the sexual stuff but it terms of emotional closeness and what is ok and what is not ok to share with them.
The biggest issue is that with one in particular it became parasocial since we were online friends for 16 years but never met face to face. But also, I find that women are often not reliable friends and these friendships tend to fade with time and in many cases they flat out ghost me. Or just break it off.
Lastly, fraternizing with women is fine but when you do so you tend to unconsciously emulate their behaviors and relational styles which can backfire when you want to actually date one.