I'm a guy who's been married for almost eight years (quite happy!) But I'm in love with her younger sister ( she nice and pretty!) I'm sure she likes me too for the same reason ... but she has a boyfriend with whom she has a lot of troubles.... I'd like to give her a book titled: Men are from mars, women come from Venus but I'd really like to tell her about my feelings straight. My wife knows about my feelings for her. What am I supposed to do?!