My last several girlfriends never turned down sex, like ever. If anything, I was the bottle neck.

My new girl has turned down sex 3 times now, citing a sore vagina the first time from the previous day's session, and last 2 times she cited bloating but I'm not sure I believe her.

Any suggestions on how to react? I generally just became cold and withdrew, but I'm not sure that was the best approach.