Skinny girl chamois recs?

You can always chance the seat to a more comfortable one!

You can always just buy a seat that is a lot more comfortable for you :)

We have a "spinner" at our gym that brings a wrench and tilts his seat up (leaving it like that after he's done--of course). He got a hold of my favorite #8 bike while I was out of town and I didn't notice--resulting in a miserable hour spin and sore for a week afterward.

The seat should be flat--not nose up or down (nose down can help with your core but can also slide you forward if your core is weak).

When picking a bike, look and see if all the seats are the same. Speak to the instructor and others in the class. Our gym had a new tech that tilted all the seats up "because that was were they were supposed to be" and there was a revolt.

Sit up if you have too. I have a bad back and some classes are better than others. Stand if you need a break.

We have a woman in spinning class who tilts her saddle WAY up - I can't see how she can stand it. Perfectly level doesn't work for me, I always feel like I am sliding off the saddle though it looks perfectly flat. Just the slightest tilt up works for me.

Settings certainly make a difference, for sure. Can you work with your instructor again to determine the correct settings for your bike? If your seat post is too high, that will cause comfort problems for your girly bits, and sometimes it can be difficult to tell just what is causing the problem. Of course, this assumes the instructor understands fit, and if he isn't a cyclist he may not really understand it.

Personally I have found bike shorts to be far more comfy on a spinning bike than the padded seat covers, but that is me.