Hello Star Dreamer,
By using the word ‘interested’ I assume you are referring to intimacy, well I am going to pinch a couple of ideas I read from a female giving advise that I read a long time ago….
A lot of guys have some form of stash of porn somewhere, if your partner does it may be magazines, if so you are in luck, because, modern pornography comes in more themes than ever, for example, age, race / colour, highlighting certain parts of the body, differing clothes fetishes, specific sexual acts, etc.
If he has a stash you may be able to learn what his ‘thing’ is.
One other thing I read, (this will show you how long ago I read this, I must have a good memory) is if you are lucky enough to find porn on the old style video cassettes then, as most guys do, the movie should be stopped on what last he was watching when masturbating, so all you have to do is put the tape in, rewind a couple of minutes and watch. Then you will really know what gets him off. Shamefully this does not work with dvds.
Once you have some insights you can use these to your advantage, maybe it will be new clothes, maybe something intimate you haven’t done before, just have an open mind, you may even discover something about yourself along the way…

Be honest & be yourself.
Then your friends will be real friends...