Fake boobs are gross. They don't look like boobs, they look like domes placed on somebody's chest. The way they look is like how children who have never seen boobs before draw boobs (or just people who are really bad at drawing).
I'm sure somebody will say "Of course they look bad if you can tell they're fake", and while I admit that maybe there have been ones I've seen while having no idea they were fake, I got two words for you: Pamela Anderson. Clearly fake-looking as hell and I always thought she was gross but she was one of the most popular "hot" women in the 90's and early 00's.