Edited after further thought:
Couple thoughts on keeping your bottom happy that you did not mention:
1. The wrong liner in your shorts will tear you up no matter what saddle you are on. Ask other women which cycling shorts have the best liner.
2. Slippery stuff (Lantiseptic, Bag Balm) smeared in the right place will save your bottom.
3. Your fit has to be right. If your single bike doesn't tear up your bottom and the tandem does, see if you can figure out what the difference is and fix it. Two possibilities are that you don't have proper single bike fit on the back of the tandem, and that you may not have enough space between the riders to use your single bike fit the same way you would on a single bike. In the latter case, you need a tandem with greater bottom bracket spacing to put more distance between the single bike fits.
4. You probably know to stand up frequently. Keep the blood circulating and everything works better.
5. Lots of women in this area who do not use the Terry Butterfly use the Selle Italia Lady Gelflow and recommend it. One or two use the men's Specialized Body Geometry saddle with that groove down the center. They have been using it for years and haven't switched.
6. Brooks makes a saddle for another company (can't remember the name, maybe Selle Anatomica?) that has a cutout (hole like some other women's saddles) and a tensioning bolt like a Brooks. This one is also highly recommended by the few women that use it.
Last edited by SDS; 03-04-07 at 07:26 PM.