The Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, narrated from Abu Al-Qasim Ja'far ibn Muhammad, from Muhammad ibn Ya'qub, from 'Ali ibn Ibrahim, from Ibn Abi 'Umayr, from Ibn Udhaynah, from Abu Usamah: He said: I asked Abu 'Abdillah عليه السلام about a junub (one in a state of major ritual impurity) who sweats in his garment or takes a bath and then embraces or lies with his wife while she is menstruating or junub. What if his body is affected by her sweat?" Imam عليه السلام replied: 'None of this matters.' (regarding being impure)