A sperm and egg can only conceive in the egg's trip in the fallopian tubes (about 24 hours after ovulation).
Any kind of foreign fluid, sperm, lubricants, saliva etc. can cause the vagina to have a different smell than it should. Also keep in mind that not keeping the vagina clean can cause it to smell...
No. Sperm is not supposed to fall out of the vagina. If a woman urinates right after sex, this can cause the semen to be cleaned out of the vagina.
no.
i have no idea. I'm still sexually pure, I keep a promise. I'm guessing no.