I like to start by sitting on the tops cock. Thus I have more control over the first few minutes of action till the poppers & lube help get things comfortable. Also in that position there can be tit play. If I'm in a location where it has to be standing, I love doggy style also. For extended fuck sessions I like being on my back with legs up. Again allowing for tit play, kissing & visuals. I suppose as long as there's cock in ass, it's all good!