Most likely it "hurts" because your not lubricated enough down there, he didnt make sure you were wet enough when he entered you. Do not let him enter you if your dry down there, because he could tear your vagina. Always use lube or spit.. or at the very least make sure you are not dry. Foreplay usually helps.
stupid male partner, or the presence of dildo instead of a penis
Maybe because first penetration or no enough lubrication.
If you are a virgin it can be because you still have the hymen, a skinfold that partly covers the vaguinal opening. If it hurts in general you're not wet enough.
Omigod, DUHHH!
Ejaculating does not hurt at all but yes it has a scent, so your mum may smell it if she enters the room where you just masturbated, and yes it stains.
Yes, it enters smoke and numerous other harmful to the body chemicals that do all sorts of things.
The opening where water enters
It enters the oviduct
Oxygen enters via the lungs.
He/she/it enters.
When you get infected with HIV, the virus enters your blood and gets inside your cells that are floating around
it enters in Egypt in cairo in the brige
The duration of Peace to Him Who Enters is 1.5 hours.
FADH2 and NADH
One that enters, especially one that enters a competition.