Uncontrollable orgasms!?!

So for the past 2 weeks I've been getting these sudden orgasms WITHOUT HAVING SEX but I've been horny and so today I was in class (aqua aerobics) and when I got in the water and soon as the water touched my private I had the biggest orgasm ever, everyone was looking at me I was moaning like I just lost it my legs kept shaking and I had to literally crawl out the water my legs were locked WTF! has anyone had this problem? If not is it normal is it just cause I'm horny all the damn time which idk why?!