The technique that one uses in order to get one to admit that they do, in fact, enjoy taking up the back door is really more of an artform.
The subtle remarks. Catching them staring at your ass when you wore your tightest girl-jeans. Leaving a condom up their ass when they passed out drunk. It's the little things that really add up to something special. Something that they can come to you, in their time of need, for further investigating. Of their prostate, of course.