Agree partner's orgasm is a real turn on,
Also have your partner tease you really bad... that will intensify.
Also a BIT, not alot of weed will intensify, however these days everyone wants everyone in ontario drug -tested so you better not... I know I transgress.
Kissing too will intensify.
Not having sex for a while will really have an intense, but quick one, so you better get ready to go again. The not having sex for a while one is like in the movies when all the forces of nature are released, but blissfully.
So will car sex but I tend not to do that any more after that UFO landed at Todmorden Mills (It was actually a Police car showing off his many bright lights).
Really going at my lady to please her for a long time turns me on.
Smell too... don't ask my why why that cheap slutty perfume is a definite enhancer.
Speaking of smell, I think you are really attracted by scent to a certain person and not to others, so find someone in this category.
Obviously someone you are really into is a definite enhancer.
So is squeaky clean.
Toys too, and you can try some ice.
That's a start.