I have 2 girls that I'm seeing now. 1 I'm having regular sex with. She asks me last night (right as we're about to have sex) if I'm dating anyone else. I lied and said no.

Is this what I'm supposed to say?..it felt really wrong and I'm not sure what to do here..

The main reason I like to have 2 girls is incase one goes crazy and drops a nuke (withholding sex). But these eastern women seem to be less likely to do that..