Hmm, I'd suggest you take a look at how turned on you would be if a chick started complaining to you about how men are such pigs and just want to get in a girl's pants, I bet that'd really get you in the mood

You gotta get a grip on your insecurities, you're never gonna be able to have a solid relationship if you're always worrying that she's gonna cheat on you. You gotta build up the self confidence to convey to her that you don't CARE if she cheats or not because you are that positive another girl would take her place in a second. That'll take away her power and much of her incentive to cheat. And she'll respect you more because of it.