Put sex last in this case..."Alice" would be experience, not necessarily an easy lay, but she'd please you better...the other girl will probably be reserved, it'll be a challenge for you, you'll have to exert a little more time and energy for her, but generally when you do finally get there with her, it's the best feeling ever...it follows the principle that we always want MOST what we can't have... But dude, for now, decide who you can spend time with day in, day out, the best...girls feelings can be so random sometimes, you could put for the extra effort for the "virgin" and then she may end up having some weird belief about sex or something like that...then again you could go for the easy lay, and she could end up being a "holier than thou, you're mine whether you like it or not" kinda bitch...figure it out from a friendship point of view first, the sex can fuck it all up in any case if the timing's not right....