a previous gf liked what she called cock-stabbing. it involved putting putting my knobhead in, then taking it out. then in, out, like that. for me, feeling the ass spasms when she orgasms is top drawer.
if you're going to get a TENS unit, get one with multiple variable settings & intensities. mine has 15 settings (pulse variations) and has a range of 0 - 50 intensity. that's enough for anyone i think lol
well it depends on what the older guy can offer in terms of an experience. it's not always only about immediate sex. the journey is as important as the end result, imho.