"DADDY!".... "Umm... hunny.... did you forget to take the pill?!?!"

Guys and Gals get the pressure to have sex from many people. Guys can be feel pressured to have sex from their friends also known as peers, buds, pals etc. also their girlfriend. They may feel that their not "as cool" as their friends until they loss their virginity. Girls get pressured mostly by their friends or their boyfriend. In a recent national poll, more than one-third [37 percent] of teen girls said they have felt pressure from a partner to have sex and almost half [45 percent] of teen boys said they have felt pressure from friends. (Thanks Corbin) Drugs and Alcohol can alter people's brain and can make them different so-to-say for awhile. While their brains are not in the right mind, they may accidentally have sex or do something they will regret (have sex). If that's not what you meant and you meant who pressures girls and boys to do drugs and alcohol? Then girls and boys are pressured to do drugs and alcohol from the same people who pressure them to have sex. They have to fit in with the crowd of people they hang out with. If they crowd they hang out with does drugs then they will do drugs. So friends and girlfriends/boyfriends pressure people to do certain things.
Making decision is a ginormous part of life; some people go about just following the crowd and others make decision's for themselves. If they don't want to drink, then they don't drink, as compared to someone not being sure if they want to drink or not... but their friend is doing it then... why not I'll do it. This is also known as being active or passive in decision making. Obviously making your own decision is better than being a follower because you are doing what YOU want to be doing. I make my own decisions for myself. I believe it is the right way to go and that way you are always in control of your life.