Yes,it'S permitted.

wer does it state it was permitted?

it is related in a hadith that nabi saw told hadhrat jabir ra why did you not marry a virgin with whom you could play and who could play with you?' also the quran says 'your wives are a tillage unto you,so approach your tillage however you desire'

you should read the gift of nikah by moulana muhammad ebrahim palanpuri and if you want more specific ref. i can check it for you isa

What prohibits ? Accourding to fiqh 'everything is halaal until proven haraam or certify the halaam with proof from the quran , sunnah & ijma

s*ck is invalid,aftar nikaah hus. can use any style but in PARDE ME.BODY CNNT OPEN SHOW DURING s*x, IS INVALID