If it's a case of talking to civvy girls eg on a dating app or better, in person, just bring it up as a 'topic' in the same way as you might say what do you think about climate change, ask about when she first had sex, work round to what she enjoys and what she doesn't. Tbh I hardly would have thought was a deal breaker with civvie sex. I'm more interested in whether she's double vaccinated and intends, or will intend, to go to bed with me. If you've already shagged her, then simply ask nonchalantly "have you ever..."