Ooooh, the w is work. I stay at home with our girls and home-school them, so I've seen "nsfk" before [Not Suitable For Kids] if someone has a video link or something sensitive they're discussing on parenting or home schooling forums, but couldn't figure out the "w".
Thank you for the link!
I'm guessing it's that the women on/in SI can be scantily clad like Cosmo is often covered at the grocery store?