Cowgirl used to be my fave, but ever since I experienced seated RCG with a visiting Houston babe, it set the bar higher for everything else.
Standing K9 in front of a mirror and surfboard tie for a close second. Not a big fan of kneeling K9 as my legs get sore quickly.
And of course being a breast man, I do love Russian and COT. Double Russian with two ladies is twice as good. And while we're on the subject of threesomes, let's not forget the 69's more inclusive cousin, the Penrose triangle
I'll be in my bunk...