Yes that is true, known as the hemipenis and is different in each species and acts like a lock and key mechanism to avoid cross species breeding and when they lock on to each other can be at it for hours!

Ok next useless fact, Smokey Robinson’s chart topping single ‘Being With You’ hit the number one spot in June 1981.

No idea why I retained that nugget of info but it’s locked in my vault of irrelevant crap.