There’s differences for diseases that are transmitted via blood or at least require heavy breakage of the skin barrier where sexual activity with less natural l

There’s differences for diseases that are transmitted via blood or at least require heavy breakage of the skin barrier where sexual activity with less natural lubrication has higher transmission risks (HIV is a notable example). But the main difference for most in general is just that gay men have vastly more partners in a short period of time. You don’t really have a straight (or lesbian) equivalent of gay bathhouses.