I enjoy sex, but how can I prevent myself from getting std?

Abstinence. ...Is the only sure fire way to avoid stds, but using barrier protection (condoms) can be effective, as can being involved in a trusting relationship with your sex partner, and knowing their std status!
Protection. 1. Know your partner - i mean his/her habits, personality, history - do they have multiple partners for example. 2. Use protection - e.g., condom, spermicide 3. Be faithful to each other during your relationship. 4. Get tested regularly to catch any std early.