No. for her to get pregnant she has to have the penis inserted in her vagina at the right time of her menstrual cycle and he has to ejaculate. sperm has to be able to get to her ovum in order to fertilize it, and it just wont happen that way, even if he ejaculates in his underpants.
Wear pants over top of the underwear.
yes
It will not harm you, doctors say you should wear loose underwear to increase your sperm.
Some teenage girls choose to wear thongs as underwear for comfort or to avoid visible panty lines. However, preferences for underwear styles vary among individuals, and not all teenage girls wear thongs.
Some people are more comfortable not wearing underwear.
underwear and a gumshield.
Some but it is unusual
2%
Yes. The overwhelming majority of chinese girls wear granny panties.
No, because boys have small penis's
Some girls like to wear no bra and underwear because they like the freedom of not feeling restricted in tight fitting undergarments.
A boy does not need to wear a girl's underwear if his crouch is getting big because the underwear is not designed for them.