Everytime I'm with my girlfriend, and she wants to have sex, she gets soaking wet and I don't even get a hard on. It pisses her off severely, and I don't know why. But I get a raging boner if she starts sucking me off, something she doesn't like to do, and I get random boners throughout the day and whatever. Just not when I'm going to have sex with her, and she's very attractive. What's up with this?