The Mishna says that if she has a vest (kavua), dayan shaytan and we are not concerned that the bed that she was sitting on a moment before is tomay. Why? A vest only indicates a particular onah - a 12 hour period. How does it indicate anything about the previous hour in the middle of an onah?
Thanks,
Dovid
Dovid Hoffman, Baltimore, USA
See the Mishnah on 63b, and Rambam in Hilchos Isurei Bi'ah 8:2.
Actually, the Veses has an actual time; however, we are Machmir to be Choshesh for the entire Onah.
D. Zupnik