Chasam Sofer explains that there are 2 reasons for the heter of Davar Shein Niscavein and none of those reasons apply by Sirus.
1346
Shabbos 110a: Geder of Issur Sris Part 1
Shabbos 110a: Geder of Issur Sris Part 1
Apr 27, 2021
2:40
Tosfos, Chazon Ish Even HaEzer 13
1347
Shabbos 109b: Geder of the Prohibition of Refuah on Shabbos
Shabbos 109b: Geder of the Prohibition of Refuah on Shabbos
Apr 26, 2021
3:41
Is the prohibition on the one performing the act or on the one receiving the treatment? Iglei Tal Tochen 38, Shulchan Aruch 328-25; Magen Avraham ibid; Shulchan Aruch 328-42
1348
Shabbos 109a: Bathing in Sea of Sedom on Shabbos+ Refuah without an action on Shabbos
Shabbos 109a: Bathing in Sea of Sedom on Shabbos+ Refuah without an action on Shabbos
Apr 25, 2021
3:07
Rashi, Tosfos, Rambam 21-29, Iglei Tal Tochen 38 23-24
1349
Shabbos 108b: Is pickling prohibited because of Bishul?
Shabbos 108b: Is pickling prohibited because of Bishul?