Slughorn would have 100% said some shit like this
His parties were basically wizard high-society speed dating
Slughorn lowered his voice, glanced around the staff room, then pulled Harry a little closer.
“Potter, listen carefully. What you do with this is your own business. But Felix Felicis is not a contraceptive. It isn’t. It never is. Liquid lucks helps you meet the right person, at the right time, in the right bed — even Malfoid’s bed — but it does not stop a pregnancy. Luck is no substitute for a condom, old friend.
So if you still planning to sleep with Malfoid, always carry some. One, two, a whole box if you likes. Felix only makes the night go smoothly. The rest is an adult’s responsibility.”