Mikvaos 8:4-5

Mikvaos 8:4

If a non-Jewish woman expelled semen from a Jewish man, it is ritually unclean; if a Jewish woman expelled semen from a non-Jewish man, it is ritually clean. If a woman engaged in intimacy and then immersed but she didn’t “sweep the house” (i.e., clean her genital area), it’s the same as not immersing. If a man who had a seminal emission immersed but he didn’t urinate beforehand, he renders himself unclean again when urinates later. Rabbi Yosi says that this is only the case if he’s sick or old; if he’s young and healthy, then he remains ritually clean.

Mikvaos 8:5

If a niddah puts coins in her mouth and immerses, she is purified of her existing ritual uncleanliness but she is rendered unclean because of her saliva. If she put her hair in her mouth, closed her hand or pursed her lips, it’s as if she didn’t immerse. If someone immersed a person or utensils while holding on to them, they remain ritually unclean but if he washed his hand in the mikvah water beforehand, then they are purified. Rabbi Shimon says that he should loosen his grip so that water can get into them. The orifices and creases of the body don’t need the water to enter them.