Reference for Kiddushin 155:3

מתיב רבא אלמנה וגרושה לוקה משום שני שמות מאי לאו שני שמות ותו לא

Then let him be flagellated on account of, 'he shall not profane his seed'? - This means, if he does not consummate the intercourse.<span class="x" onmousemove="('comment',' So that there is no issue.');">⁴</span> Raba raised an objection: [If a High Priest has intercourse with] a widow and divorced woman,<span class="x" onmousemove="('comment',' The same woman being both.');">⁵</span>

Jastrow