I recall I saw a video once where a woman was tied down steadily on the bed (and gagged), her legs and pussy spread open (I mean, the vagina was forcibly held wide with some kind of metal springs & bars) and a thick, lit candle repeatedly held deep into the opening - fire counts as a live force, right? She shook every time, trying to escape the heat. Horribly fascinating...

Sex with an octopus arms? oh wow...