25% full sex with a man!? :-O What, in jail?
That figure is from a Playboy Magazine study from the 1970’s. I suspect that it is correct.
Another figure is the Kinsey Report number of 37% of men having sex with another man, but that figure is probably too high.
It is very hard to poll such things because men lie about it so much.
The number of non-gay men who have had sex with another man is higher than you would ever think. Most of these contacts appear to be experimental or exploratory among young men. These men are basically straight but have had a minor amount of trivial or minor sexual experience in their histories.