Gemara:

Avoda Zara,  Ketuvot,  Nidah,  Shabbat,  Yevamot 

Halacha:

General 

References: Ketuvot: 39a ,  Yevamot: 12b ,  Yevamot: 71b ,  Yevamot: 72a ,  Shabbat: 129b ,  Nidah: 31a ,  Avoda Zara: 30b  

Description

Yeshivat Har Etzion: This shiur explores the principle of shomer petaim Hashem - when the fact that an activity is normal mitigates the prohibition to engage in dangerous activities. Does it mean that there is no danger from a Halachic perspective or that it is permitted to put yourself in danger?