Quite simply, his penis isn't stimulated enough to orgasm... For whatever reason. It could be for a physical reason (such as an adult circumcision leading to decreased sensitivity) or a psychological problem (such as a conservative upbringing and/or view on sex, etc). It is probably something that should be discussed with his doctor.
probably a really bad spanking
no
Either he is excited more by her or she does something differently.
nothing risky happens..
yes
Usually, no (unless he's masturbating).
When a guy cums on your neckline, it is called a Pearl Necklace.
Well there's 2 different meanings. One is a type of dance and two is a sexual act, where a guy cums on a girls face.
no
No, Because your dietry system is separate to your reproducive system
The girl gets pregnant and another idiot is born.
No.