Parashas Metzora · Passuk 15:18
Chabad.org — English translation + Rashi
Torah Temima points to Yevamos 34b.
English: “A man lies with her” — “with her” excludes [bi’ah] shelo kedarkah [from making her impure; he himself remains impure because emission left him].
Normal bi’ah for her impurity
Chazal limit the woman’s impurity from this verse to bi’ah kedarkah; the man’s impurity depends on emission itself.