This really depends on the people - I have no favourite, couples, three singles, friends, whatever..... it is all good if everyone knows what their role is and communicates what they want - and being a filthy minx or tomcat helps too! People who give in and let the sensation and experience take over and stop worrying about how they look, or what the other one is up to.
Here is where I tell you how to take down the hard to capture unicorn. Executed correctly, it is ruthlessly effective. It is also, in its whole, though not necessarily its parts, very dishonest. This is the strategy for the couple who are all about the hunt. For whom the intellectual and primal challenge are the motivator, rather than necessarily the end product. It is completely unethical in its construction, yet if done right, everyone goes away happier than any other strategy I know of. Sorry, my unicorns, here is where I expose your Achilles' heel.
Everyone's guilty of making assumptions at some time....judgement is human nature, it's a survival tactic...so you can't be too hard on people about it...just put them right when they make an assumption of you, if you care enough to...mostly I don't care enough about other people's opinions of me...the time I care is when I actually care about the person making the assumption.