Is it normal to have foreskin attached at the rear of penis head

I think you're referring to the frenulum (frenular delta). It's a band of tissue, just like the one inside your top lip, that acts as a kind of pivot point for the skin so it can't be retracted down too far. Some people are born without a frenulum and the skin can slide freely all the way down. In a normal male, the foreskin retracts down behind the glans. In an erect penis, the foreskin usually retracts about 1 cm below the corona of the glans, while, with some guys, the skin doesn't retract much at all and the glans might still be covered when erect, but that's rare.

Uhh... yeah, because men if they are uncircumsised have a foreskin over the head of their penis.

Yes, go have sex then tell us what happened