Definitely support. Topless women may be a strong social taboo, but that doesn't mean it should be illegal. Also, it would be good if it were far less taboo. Yes, plenty of parents don't want their kids seeing topless women, but it isn't objectively harmful. Also, its pretty arbitrary to keep the female nipple off limits while the rest of the female breast is okay.
It's quite something how people who disagree on if climate change is real, if borders should exist, and if police should exist agree that you'll die if you see a boob before your 18th birthday.