I have hosted several wrestling parties, one of which was done in jello. Though it was fun, I have a few recommendations for anyone who wants to host one of their own.

We sprayed each other down with soapy water before entering the "ring," which was a big, inflatable pool filled with jello. It's really necessary, because jello is not the slipperiest of substances, and you need something that can really stop you from getting a good hold to make the wrestling worth while. There is absolutely no sexual component to our parties, but if you have the choice, I highly recommend buying a couple of tubs of lube off of Amazon and hosting KY wrestling instead - it saves you the trouble and makes for a less sticky mess. Definitely have a hose around to clean up with either way - I hosted mine inside because I lived in Canada at the time and it was far too cold, so I expected a mess. What I did not expect was people trekking back and forth between the shower, getting water everywhere (of course no one listened when I told them to bring their own towel).

Anyways, I'll stop going on, but I have loads of practical advice about that sort of thing if anyone has any questions. =)