One who cohabits with his yevamah —- whether mistakenly or wantonly, whether coerced or willingly; even if he was mistaken and she was wanton, [or] he was wanton and she was mistaken; [or] he was coerced but she was not, [or] she was coerced but he was not; whether the union was [only] partial or complete —- he has acquired [her]. There is no distinction between the forms of cohabitation.