So as per topic, what should i do? He is standard 5 iinm. I dont care if he watches straight porn since i think most of us did the same at that age 

Its still not to late to counter.

Invite him to play soccer n football or put him into classes

Throw away all of his pink and girly shirts, buy hin jersey jersey n jersey

If u see any of he interest sounds girlish example he likes sewing and baking, ask him to to more manly works like carpenting  fishing

Also check who is guy friend, if sissy sissy one telll him dont friend with them

Lastly strengthsn  his skill on prayers.