Be honnest guys!
Well, i have been in the industry for only 3 years but i have seen loads of flight deck tarts, one being a good friend of mine actually.
The "tarts" tend to be new in the industry, usually very young and easily impressed. It s quite sad in a way. But after a while girls get to see that a captain is a normal kinda guy and their job is like ours, not glamourous. And most flying dinosaurs (5 years + flying) cannot stand the thought of a captain being intimate with them.
So yeah, unlike what has been said here, i do think that things happen but it is usually very brief and make people usually sad in the end. How many night stops ended in tears when crew slept together under the influence of alcohool?