This question is not clear. Some straight men have gay sex but are not gay, defining gay sex as same sex sexual activity and gay as a person attracted to someone of the same sex. Sexual attraction ad sexual action or activity are different.
What exactly are you asking?
As a gay guy, is it possible I could tempt a straight guy with a good BJ? Yes, it is. And that person would still be straight.
Seducing a straight woman by a straight guy would involve a false act, a lie, a sham, a fake promise generally.
To seduce a straight guy, when it happens, which is not very often, there isn't generally false promises and lies.