Troubadour.
I don't know why you find that so difficult to understand, that one gay encounter might still carry ten or more times the risk of a similar single hetero event.

Because it is wrong Troubadour!

Anal sex is far more risky than vaginal, but as Musket says, heteros do it too.

Unprotected sex is far more risky.
That is an issue for all preferences.
Multiple, concurrent partners is far more risky.
That is an issue for all preferences.

Does anyone know a different issue, or are these the issues that determine infection rate in any preference group?