Yes, she is a practicing Buddhist. She uses my (I think very reasonable) desire for sex as a perfect example of an "attachment" which causes me "suffering."
And she's right. Of course, your attachment to your marriage is causing you to suffer as well. If she's a real Buddhist she ought to consider looking for the middle way.
That book Martelo recommended is very good so far.
Stop WaitingFeel EverythingLove AchinglyGive ImpeccablyLet Go
