[slim]

do you mean that vaginal sex is less risky than anal sex? Wikipedia says otherwise https://en.m.wikipedia.org/wiki/HIV/AIDS#Transmission

do you have any source for what you believe?

[at_a_remove]

You may wish to try https://en.m.wikipedia.org/wiki/HIV/AIDS#Transmission

Receptive penile-vaginal intercourse* at 0.05–0.30% Receptive anal intercourse* at 0.04–3.0%

Given the error bars ...