not sure if this is even done much. I am sure it has been done before. But I have never heard of it before until I thought of it. after 9 years with the same partner, you come up with some crazy shit without getting too crazy. And I get anal in once about a blue moon so I have to leave that out of the picture most of the time. but here is what I call hot --> cold sex first me and my SO have hot tub sex for a while until we feel we are ready. I usually make her orgasam first while we are in the tub. also, I have a larger garden tub so it makes this a bit easier. I guess you could do it in a tub shower also. then she sits in cold cold water for about 10 minutes by herself. cold tap water and last time I put in a few ice cubes to speed it up. also I play with her for a while to get the cold water in her a bit. then we go to the bed for standard missionary sex to warm her up. I usually only last about a minute or two but she says its the best sex she has ever had. The burst of warm sperm in her somewhat cold vaginal area make it feel really good too her. her vagina tightens up a bit durring this so it makes it incredable. anyone else ever done this before?