Monkeypox. Why is it mainly affecting gay men?

There doesn't seem to be an answer to why men who have sex with men get monkeypox. This will cause problems in countries where being gay is illegal.

HIV didnt spread evenly across groups. They may not even know yet why it seems to be predominantly affecting gay men. Many of the campaigns/information put out at the start of HIV were to be honest not helpful but governments and health services were faced with unchartered territory.

I expect it will be a bit like AIDS. At the beginning we weren't told it was mainly spread through gay sex.