Originally Posted by kramus

Your son ought to know about your lover just as a heads up. After all, a total stranger is going to be knocking on the door late at night, and your son may answer. He will see some fellow who possibly looks to be younger than him. Your gentleman caller will see some stranger at the door of his lovers house when he comes calling.
Both guys ought to get some notice, but neither one needs more than a "by the way".