Praise be to Allaah.
Many scholars are of the view that semen is pure (taahir),
whether it is emitted as the result of a wet dream or intercourse. This is
based on a great deal of evidence, including that which was narrated by
Muslim in his Saheeh (288) from ‘Aa’ishah (may Allaah be pleased with
her) who said: I remember scratching it [semen] from the garment of the
Messenger of Allaah (peace and blessings of Allaah be upon him), then
he prayed in it.
Al-Nawawi (may Allaah have mercy on him) said in Sharh
Muslim (3/198): Many are of the view that semen is taahir (pure).
This was narrated from ‘Ali ibn Abi Taalib, Sa’d ibn Abi
Waqqaas, Ibn ‘Umar, ‘Aa’ishah, Dawood and Ahmad according to one of the two
reports. It is also the view of al-Shaafa’i and ashaab al-hadeeth. End
quote. See Fath al-Baari (2/332).
It says in Fataawa al-Lajnah al-Daa’imah (5/381): The
emission of semen as the result of a wet dream and the like does not make
naajis the clothes worn by the one who has the dream, even if it gets on
them, because semen is taahir. But it is prescribed to remove that which
gets onto one’s clothes as a matter of cleanliness and removing dirt. End
quote.
As for madhiy (prostatic fluid), which is what is emitted
during foreplay or when thinking about intercourse, it is naajis, but
sprinkling water on it is sufficient to purify it, because of the report
narrated by Abu Dawood in his Sunan (210) and by al-Tirmidhi (115)
and Ibn Majaah (506) from Sahl ibn Hunayf who said: I used to suffer from a
great deal of madhiy, and I took many baths because of that. I asked the
Messenger of Allaah (S) about that, and he said, “Wudoo’ is sufficient for
you in this case.” I said, O Messenger of Allaah, what about the madhiy that
gets onto my clothes? He said, “It is sufficient for you to pour a handful
of water on the part of your clothes where you see the madhiy has gotten
onto them.”
See also question no. 2458.
Based on this, intercourse and emission of semen does not
mean that the clothes or body become naajis. As for madhiy, it is naajis but
sharee’ah makes it easy to purify it, since sprinkling it with water is
sufficient and it does not have to be washed.
The place that should be sprinkled with water is only the
place where the madhiy got onto. As for the rest of the garment that was not
touched by anything, it is taahir.
And Allaah knows best.