DMP/Getty ImagesThe other night, I was watching a movie with the guy I've been seeing when, sure enough, he started caressing my thigh. I immediately thought, “Oh, I know what this means.”We've all been there. Pawing at someone's chest, letting a hand linger a little too long on their back, maybe batting our eyelashes like we're auditioning for a rom-com. Many of us will do just about anything to avoid saying the words, “Want to have sex?”Or maybe, in spite of how horny we may feel, we don’t do anything for fear that we will come across as “too much” or be turned down.Even in happy, long-term...