Well you really have to get him to want it as well, like the song says. "It takes two babe..."
Luckily I learned this when I was 18 with a girlfriend... and her girlfriend. Was a real shock at the time but I got an education of a lifetime that's served me well.
I haven't seen either of them since 1981 but will never forget them.
Luckily my wife is also interested in keeping things spiced up as well so I can honestly say I am likely way above average in satisfaction there even with 16 years in the marriage.
We both entertain each others ideas and give them a try. Like the saying goes, we'll try anything once, twice if we like it.
Find out what catches his interest... pick one thing.. then another, one step at a time. Hopefully he will take the que.