Reference for Kiddushin 37:8

ואיבעית אימא מאי מדעת מדעת דידה דתני אביי בריה דרבי אבהו (שמות כא, ח) אשר לא יעדה מלמד שצריך ליעדה

he who has intercourse with her incurs the penalty for [adultery with] a married woman: hence we are informed [that it is not so]. What is our decision on the matter? - Come and hear: For R'Aibu said in R'Jannaiðs name: De can be performed only by an adult; designation is only by consent.<span class="x" onmousemove="('comment',' Of the man; the first half solves Resh Lakish's problem.');">¹¹</span>

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