One of the girls I am seeing has a problem that she gets rubbed raw by latex condoms. We use lube and she is more than ready, but I do tend to go for a long time and it gets very sore. Is it the latex? Any other lubes that may work better? (we use Astroglide or Trojan). She likes that I can go on forever, but I feel bad that I rub her raw. (also, I have to give her two days in between for recovery)