Reference for Shevuot 34:11

וקאמר זו היא מצות עשה שבמקדש שאין חייבין עליה ואיזו היא מצות עשה שבנדה שחייבין עליה היה משמש עם הטהורה ואמרה לו נטמאתי ופירש מיד חייב מפני שיציאתו הנאה לו כביאתו

[THIS:] IF ONE COHABITED WITH A CLEAN WOMAN, AND SHE SAID TO HIM; 'I HAVE BECOME UNCLEAN!', AND HE WITHDREW IMMEDIATELY, HE IS LIABLE, BECAUSE HIS WITHDRAWAL IS AS PLEASANT TO HIM AS HIS ENTRY. It was stated: Abaye said in the name of R'Hiyya B'Rab: He<span class="x" onmousemove="('comment',' Who withdraws forthwith.');">²²</span> is liable to [bring] two [sin-offerings].<span class="x" onmousemove="('comment',' V. infra.');">²³</span>

Jastrow

Jastrow