well, i believe that you may get pregnant if you share the same toilet seat because the sperm can survive up to 36 hours. in fact, that means they might travel inside you. But i'm not quite sure about the bath and if its possible that sperms can survive in water.
If you are both in the bath at the same time and having unprotected sex then you could end up pregnant. But that would be a rather stupid thing to do wouldn't it.
All german websites i found on that topic say that the odds to get pregnant are 1/1000000. Thats because the sperm is immediately killed if the water is not in the temperature range of 32 to 38�C or if some bubble bath or soap has been added and even if not its very unlikely that one of the little ******* finds the right direction AND the egg. So asically it is possible but veeeeery unlikely
SCARFACE a sperm can survive for up to 3-5 days BUT only in strict conditions as thekraut mentions - they have to be kept at the right temperature AND the right ph (acidity level), and in liquid, so they survive for about a few nanoseconds on a toilet seat