I 'm glad to see this topic here. I 've been heavily into practicing tantric meditation the last 15 years approximatively. Currently I'm focused on the Tibetan (or Left Hand path) aspect (westerners now it as sacred sex (but I prefer it to call it ritualistic sexual meditation).
It is true that tantric sex is otherwordly if you would like to have an insider's opinion. Once properly in it, there's no turning back to the "western" way...