Reference for Sanhedrin 149:4
רב פפא אמר משום פגם משפחה רב אחא בריה דרב איקא אמר כדי שלא יהו בנות ישראל פרוצות בעריות
and his heart was consumed by his burning desire [his life being endangered thereby]. When the doctors were consulted, they said, 'His only cure is that she shall submit.' Thereupon the Sages said: 'Let him die rather than that she should yield.' Then [said the doctors]; 'let her stand nude before him;' [they answered] 'sooner let him die'. 'Then', said the doctors, 'let her converse with him from behind a fence'. 'Let him die,' the Sages replied 'rather than she should converse with him from behind a fence.' Now R. Jacob b. Idi and R. Samuel b. Nahmani dispute therein. One said that she was a married woman; the other that she was unmarried. Now, this is intelligible on the view, that she was a married woman, but on the latter, that she was unmarried, why such severity? — R. Papa said: Because of the disgrace to her family. R. Aha the son of R. Ika said: That the daughters of Israel may not be immorally dissolute. Then why not marry her? — Marriage would not assuage his passion, even as R. Isaac said: Since the destruction of the Temple, sexual pleasure has been taken [from those who practise it lawfully] and given to sinners, as it is written, <i>Stolen waters are sweet, and bread eaten in secret is pleasant</i>.<span class="x" onmousemove="('comment',' Prov. IX, 17. ');"><sup>4</sup></span>