Don't base bedroom activity off of Astrology, believe me, I've studied Astrology extensively for 4 years, it has more to do with personality than it does with what you like sexually.
Why don't you just ask the guy what he likes?
Not all Sag's are created equal, the Archer may be the sun sign but your Ascendant is the marker for how you appear to the world, and then there's the planets and the houses and the transits...
It's extremely complicated, don't take it on faith, take it with a grain of salt. It's like Tarot Cards, part probability, part magic(magic being that indescribable oomph), and part interpretation.
Ask the guy what he's into, don't make assumptions off of what Astrology tells you.
That's like saying all Scorpio's are possessive, jealous, sex Gods--it's a generalization. That's no Bueno.