Mesorat Hashas for Yevamot 6:1

הַבָּא עַל יְבִמְתּוֹ, בֵּין בְּשׁוֹגֵג, בֵּין בְּמֵזִיד, בֵּין בְּאֹנֶס, בֵּין בְּרָצוֹן, אֲפִלּוּ הוּא שׁוֹגֵג וְהִיא מְזִידָה, הוּא מֵזִיד וְהִיא שׁוֹגֶגֶת, הוּא אָנוּס וְהִיא לֹא אֲנוּסָה, הִיא אֲנוּסָה וְהוּא לֹא אָנוּס, אֶחָד הַמְעָרֶה וְאֶחָד הַגּוֹמֵר, קָנָה, וְלֹא חָלַק בֵּין בִּיאָה לְבִיאָה:

If one cohabits with his yevamah, (he acquires her) — whether unwittingly [thinking her to be another woman], wilfully, [wantonly, and not for the sake of the mitzvah], constrainedly, or wittingly. Even if he is unwitting and she wilful; he, wilful and she, unwitting; he, constrained and she, unconstrained; she, constrained and he, unconstrained. [Not only (is she acquired) when she intends the mitzvah; but even where both do not intend the mitzvah, as when he intends a different woman and she intends a wanton act, he acquires her, it being written (Deuteronomy 25:5): "Her yavom shall come upon her" — in any instance.] Whether he is ma'areh [If he does not consummate his intercourse, but just inserts the corona alone (The touching of the corona without entry is called neshikah, "kissing"], or consummates the act, he acquires her. [And he inherits (his dead brother) and he must give her a get if he wishes to send her away.] And no distinction was made between one type of intercourse and another [whether normal or non-normal (anal) intercourse, it being written (Leviticus 18:22): "the lyings" of a woman, Scripture positing two "lyings" for a woman.]

Tosefta Ketubot

The [legal] power of a wife is greater than the power of a yevamah (one whose husband died with no children and now is in a legal bond with her former brother-in-law which either ends in marriage or halitzah) [in some respects], and the power of a yevamah is greater than the power of a wife [in other respects]. The power of a wife is stronger—for a wife eats terumah [if her husband is a kohen] as soon as she enters the bridal chamber, even before she has had sex—which is not true for the yevamah. The power of the yevamah is stronger—for a man who has sex with his yevamah (i.e. his dead brother's wife), whether intentionally or unintentionally, whether forced or willingly, even if she is in her father's house, he acquires [her as a wife]—which is not true of a wife [with whom a man would need to have sex with the purpose of betrothal].
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