Whether you are sexually active (having intercourse),
want to be, or have been having sex for a while, it's really up to you
to talk about birth control with your partner unless you want to be a
daddy. Don't assume she's on the pill or that "pulling it out in time” will
work.
Sex is fun and should be, but it can have negative parts as well. Babies and STDs are no joke. You should take the time and find out about the different types of birth control that are out there and how well they work. It can be fun to include your partner in this too, then you can make smart choices together. Using birth control that works makes sex even better because you're not worrying about getting your partner pregnant.
A really effective method for men is to use condoms. You can learn how to put one on right here. A more effective birth control is to use a condom with your partner using spermicide like contraceptive foam, suppository or gel. Using these two methods together is more effective and protects from getting STDs too!
If you are positive you don't want to be a dad or are done having children, there's a permanent birth control for guys – vasectomy. It's a simple, quick procedure that blocks the sperm from going into the semen. You still ejaculate or cum, but there's no sperm in the semen. You don't lose your desire or ability to perform, you just lose the sperm!