I took 2 different straight guys with me to gay clubs (on different occasions). One was totally fine and was having fun, the other one wasn't at ease, was hugging the wall most of the time and was avoiding any sort of eye contact with anyone.
TO EVERY STRAIGHT GUY:
Not many of you understand that straight girls go to gay clubs when they wanna have fun.You would be an unexpected surprise for them,and you won't find any competition.Plus the music is better.