>>1259634PJGirls are the current masters of this art (great lighting and camera work).
ALS Scan, ALS Angels, InTheCrack have also excellent content (even though ITC has fallen a little bit lately, very very few scenes compared to what they used to).
FTVGirls has some, they used to do a lot of scene during their first years, but lately dropped and now it's kinda rare (but you can still find plenty of very nice stuffs from them).
18Closeup, very beautiful models (mostly russian I think).
And there's also the "fetish" version, with gyno-x and exclusiveclub (gyno exams), exposednurses (same, but just the girl and no "doctor" ) and gapemypussy (mostly gaping, but a lot of speculum scenes too).