Originally Posted by scotzoidman

It's also worth noting (or at least I think it is) that with arousal blood flow increases to various parts of the body in both sexes, & of course the heart rate increases to keep this supply up. Once saw a Desmond Morris documentary where they showed infrared footage of the process, with the lips, chests, loins, etc. swelling & warming; it was, um, interesting...& of course, very enlightening...