As opposed to not having had sex with her yet, in general, how much does (good) sex change her attraction for you?

Does it impact her much more if she's younger and has had little or no past partners? What about which number date it happens on?

How about if you give her oral too, or if she sleeps over and you have several sessions through the night. Does that make a huge difference of just PIV once and then one of you leaving to go home?

Reason I'm asking is my interest in just a quick first sex is pretty low. Sure, if I'm horny it's extremely temping, but I'd rather wait until she comfortable enough to spend the night. That sound a lot more appealing and fun, as well as more impactful on her attraction level. Rushing though sex with someone the first time seems like a recipe for a less than ideal first impression.

How do you guys handle the first time with her?