My roommate is becoming really promiscuous !?

Hello I'm Alex. Me and my best friend Alejandro are gay we recently moved from a small country suburb in Virginia to the city in Washington D.C. We just graduated last year we're both 19 anyways we love living in the city where on the west side so it's fun safe clubs,musems 5 minutes from the white house and the rent isn't horrible life has seemed. Perfect but my roomate has chaged since moving from the country he was real nice with morals etc. Now He spends money like wanters is blowing up his credit cards we club alot I meen we live in dupont circle but I noticed he is clubbing every night and he's bringing home new guys everynight. Just within december he's brong home at 14 differn't guys an dhas had with them I can hear it and he dosn't seem ashamed at all. I don't want to sound prude because I'm not a saint myself but it's kinda redundant seeing a new naked mexican or italian guy cooking naked in my kitchen or layed on my couch. I love him dearly but this new nonchalant celebrity sluttacious attitude is getting to me and I'm afraid for his health what should I do. This kid was a Virgin when we moved ot the city on Halloween and he's sleep with at least 35 guys !