Human form - can breath through nipples and lick own elbows, fun pallor trick for any occasion! Other than this its a pretty basic bipedal form, if you want a sex form i would suggest a half pig half lion crossbreed, having 30 minute orgasms and being able to do it 50 times a day can have its advantages.
Cheese form - well no one expects the cheese do they? generals, Goa'uld and yes even jack all enjoy cheese, in fact the only 3 things in existence that do not like cheese are the Quagarrs a race of cheese phobiacs, Cheddlar, the Goa'uld impersonating the god of cheese surprisingly enough and finally Mrs. Miggins or 65 round top lane Cornwall England Earth (Tauree)
Please note: when spying on the mortals turn into cheese, it is the last thing they expect, how else do you pop into old friends and suddenly know everything that's been going on?
Goa'uld symbiote form- Ahh the joy of this form, nothing can be better than popping into a mortals bed wriggling around their neck and then disappearing, its not interfering its mealy education to um. . . always be prepared . . . yeah to all ways be prepared!
Poltergeist form - Turning invisible and walkthrough-able being, this can be entertaining in sooo many ways, I will erm, let you experiment COUGHschoolgirlsCOUGH
Now these forms are basically it, the Nox don't tend to like being impersonated, besides any time you annoy them they revive you and beat you with reeds, and you were thinking their flying citadel was paradise? The Furlings on the other hand, well unless you want to be farmed by Furbey© stuffed and have a primitive jukebox rambled down you I would strongly advise against this form!
On a final note, it is strongly advised to go against the grand counsel's wishes and post your erotic experiences into playboy. . . . They would much prefer it if you posted it directly to them as they can not get out much.