It's better not to encourage them, in my opinion. If you contribute to their 15 minutes of fame, you'll get more copycats.
On the other hand, they're just breasts and breast never hurt anyone. Quite the opposite (excluding cancer of course)
What these women find sexy - sticking their tongues out etc. - I find trashy and repulsive.
It is not like they made an OK hand gesture, or maybe the sign of the cross.