I've never had sex with someone that I was completely in love with. I've had sex with girls that I was in a relationship with at the time, and I've had, um, shall we say, paid sex, and there's definitely a difference. With a girl that I have a bond with, even if it's not true love, I've felt more comfortable with overall, but less comfortable saying something like "I want you to suck my dick now." With a stripper/escort I don't feel quite as uncomfortable saying something like that, but the hugging and cuddling that makes sex with someone you care about great is very noticeably absent.