With the ben wa balls, they say they are good for orgasms, but based on the same principal of helping strengthen your pelvic floor muscles, which contract when you 'O' (and heighten the sensation). I don't know if I'd want to use them after birth unless I'd been using them before it, because there is the potential for them to fall out if things got too slippery, not to mention having to clean them ALL the time with the post-partum bleeding - ick

As for buying them, I'd happily recommend D.Vice, for in person shopping or online (
www.dvice.co.nz) - I find they are a lot classier than other places. I once considered being an agent for their 'toy parties'

It is quite an interesting sensation having them inside though, especially if you have to run or walk at any considerable pace !