Is it permissible to perform Salat after drinking semen, knowing that no semen was discharged from the woman?

Intentionally drinking semen is not permissible because it is considered repulsive. Even with the view that it is ritually pure (tahir), it is not allowed to drink it due to its repulsiveness. However, drinking it does not affect the validity of the prayer. Some scholars hold the view that whoever drinks an impure substance without necessity must vomit it out. If they do not do so, despite being able to, they must repeat their prayers indefinitely. As for swallowing it as a result of a husband ejaculating into his wife's mouth, please refer to Fatwa no. 31122.