Surely all men know how to give a handjob, if only to themselves..
Most straight guys are likely better than women just because they are more experienced and can actually alter their technique to maximize pleasure, which is usually not the case for women because they don't get honest and instant feedback about their performance.
Straight or gay, I'll never find out.
I can live peacefully not knowing
It's ok, because I know.
The League of Gentlemen had a episode about this