Speaking of nuts in hot water. I was at a work conference a number of years back in the UK, the guest speaker was a guy called Steve Smith who played rugby Union for England back in the late 70's eaerly 80's, he was scrum half. He alter founded a clothing company called Cotton Traders, so he was there as a business men firstly and a rugby player was an interesting tag line. So all the company directors and senior managers and some lackeys like me are there, and he starts by introducing himself and then saying, "I was told I need to keep it short, so I have had my dick in a bucket of ice for 5 mins'' , I nearly spat my beer out and the look on the directors faces was priceless. He then went on to talk about rugby for an hour, and maybe business for 2 mins, very interesting guy.
But back tot he point at hand !! I saw a anecdotal study done on TV, which had groups doing, warm baths, cold baths or heat rubs (like deep heat) to see what the effect was on post exercise muscle soreness, the results as I remember them were that the warm bath was just as effective as the cold, so better to just relax in a warm bath with some bath salts in than to freeze your nuts off in ice.