Two things you should never say to a woman in bed.
1. Never say “I love you” for the first time when you laying in bed with a woman, either during sex or pre- or post-coital. It just makes it seem less sincere. Of course I’m a wonderful lover and you either are about to have some damn good sex, or you already did, but come on guys, at least try to make it romantic. I tend not to believe that a guy is really in love with me when he says that at that particular moment. And definitely don’t say it right before sex because then it just sounds like you’re trying to get in my pants, and that’s just sad.
My first husband told me that he loved me for the first time while in bed, post-coital. It was not romantic and I honestly didn’t believe him at the time.