Is it normal to talk about sex with my teenage daughters?

I have two issues-

I have two daughters. the other day i recalled the time when i was teenage myself. As teenagers we used to get embarrassed most of the time by the stupid so called boys while passing my the street. we had to face rude remarks, vulgar words and all those shits. we would turn red and feel so insulted. our such condition would encourage those guys even more and we would be angrier like anything else. as my children have stepped into their teens...i do not want them to go through that same thing again. so few days back what i did was while working in the kitchen i casually told them about those incidents and told them to pronounce those vulgar words. this way i felt that since they have pronounced such words with me (their mom) they will not feel as embarrassed and humiliated as we used to be. so when those boys will get no such reaction as we used to have (getting red and running away) those boys should feel embarrassed themselves.

did i do right...i.e is it normal?

how do i properly give sex education to my daughters without damaging their teenage psychology?

Dear Friends, I come from country Nepal. we in our country have to protect human rights ourselves. in every steps we struggle to just live peacefully which is very difficult. We do not have strong government, policies and laws to protect ourselves. so while answering please keep these things in mind as well.

Thank you.