i think alot of girls think like this nowadays. they think that having sex with their boyfriends would make their relationship last longer and so they never think of the consquences that they'll face after that and how their parents would feel. i believe alot of girls also don't really understand the meaning of like and love yet. although there are quite a number of teenagers in relationship but these relationships hardly reach till 6 months, however there are very rare cases that turn out to be successful.
i don't think now is a very good time to have a relationship as that takes alot of your precious time. at this age we are students and as a student his/her job is to study for his/her future, as these are the steps needed to be taken to fulfilling our dreams. and just because we want this short period of "love" aka puppy love we might put our studies a side. this obviously would/will affect our steps to our dreams. so i think the best is not to have a relatonship at this age as that can wait.