Howie Mandel to Cops: People Are Screwing in My Bathroom!!!

Howie Mandel summoned cops early this morning because it sounded to him like people were having sex in his bathroom ... TMZ has learned.

Want to know more? Well Howie was having a 4th of July party at his Calabasas home and it lasted ... well, into the 5th of July. At around 1 AM, he walked past his bathroom and heard the sounds of sex.

Ever the cautious person, Howie thought it might have been a sexual assault, so he called 911.

Police came, interviewed the 2 subjects -- a male and female ... both 21 -- and they confessed they had a few libations and got carried away.

We're not saying the dude has premature issues, but those cops must have really responded quickly.