So I took my new bike out on the weekend with gf on the back. The seat is the slippery'est seat I have ever had (amongst 15+ bikes I've owned this is the slippery'est). She's sliding around on the back of it like a skating rink. Have you guys tried this ?

http://www.triboseat.com/examples.htm

Or what else have you done to make your seat less slippery without doing an outright seat replacement... Is there a local supplier that makes something grippy ?