The last time we saw Shauna Sand she was caught on camera having sex on the beach with some dude down in St. Barts, so as far as exposure levels in her public recreation time, flashing the bulk of her mammaries while on a bike ride at Venice Beach seems like she's kind of covering up.
Say what you will about Shauna Sand (and we've said most of it), the girl does not seem to try to hide who she is or what she loves doing. I suppose there's some grace in that. Plus, you get to see her knockers. Just saying. Enjoy.