Guys - is it OK to ask if you're 'close?'

Yes it's ok, but instead of taking the time to ask him and for him to give an answer, just start making orgasm noises of your own. You know what I mean. When I hear a woman cumming, it triggers my own orgasm. Try it when you're ready for him to come and it will make him cum. At the same time, grab his ass and I like it when she grabs and gently squeezes my balls when she makes orgasm sounds. It gets me off quickly.

It's very hard to finish at the same time but if your close than just say what you want. Faster,harder. If he's ahead of you well it's tough for us to stop it. Try oh baby when are you going to fill me with your "C" or give me your "C" I would not be offended as I want you to have as many orgasms as you can. Unfortunately WAY too many guys are just in it for their own gratification.
I do believe this & do this. It's ALL about her if I'm giving she may want to come back & give me more

Sure its ok. it's probably more about how its said (don't want it to sound like "are you done yet"), but make it sexy. Say ohhh yes are you cumming. that feels sooo good. etc.

I would think that was really sexy.

I give you props if you and your men can finish at the same time. I envy you for being able to finish while he's thrusting. I agree with p-guy on the asking part. You could say just about anything to a man in bed as long as you make it sound sexy.