Is it safe to make love with a fun-condom?

Fun-condoms are, like the name suggests, just for fun. They don’t protect you from pregnancy or STD’s. Though they are nicely made and you can use them once in a while for a laugh, you cannot rely on them. Some think it’s a solution to roll it down over a regular condom. But that doesn’t work. Because they’ll rub together you run the risk that the regular condom will tear.