Is it normal for a gay guy to want to pleasure a straight guy?

I'm not interested in trying to be in a relationship with them and I'm not some idiot who thinks they can make a straight guy gay, but is it normal to want to pleasure a straight guy sexually? Just suck him off with out reciprocation or get fucked by him?

Sometimes I just like the idea getting used by my straight guy friends for their pleasure. Any straight guys do this with their gay friends?