Answer:
(Fatwa: 1782/1381=H/1429)
It is allowable to talk about their sexual relation.
Seeing is also allowable, but not better.
Doing it standing is not haram or sin, but it is not better too.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
