What is the ruling on someone who finds semen on their clothes after sleeping (due to a wet dream or inadvertently seeing something) – is ghusl obligatory upon them, and what should they do if they have a medical device in their body that prevents them from performing a proper ghusl?

The emission of semen, whether in sleep or while awake, if accompanied by pleasure, necessitates ghusl (ritual bath). If there is a legitimate excuse preventing ghusl due to a medical device that cannot be removed, then it is obligatory to wash what can be washed and perform tayammum (dry ablution) for the remainder, or perform tayammum fully if ghusl is entirely impossible.