Generally my SO will kiss me on the curve of my neck, and something about his kiss and the scratch of his grown out stubble (that gets me going too, so he keeps it like that) makes me go craaazy. And when he growls or talks real low into my ear while he nibbles. I also like teasing him and being teased, but I think most people like that.
For him generally all I have to do is lick, suck, and nibble at his neck, but sometimes just a nice, slow kiss will work. He's pretty much ready to go all the time, but luckily I got a guy that sometimes just wants to cuddle.
