Hetero/Homosexual: Are People Born with a Sexual Preference, Or Is It Learned?

Many has argued whether or not, people are born gay. My question is, are people even born straight? At what age do we begin showing interest in a particular gender? Can someone actually be born gay or born straight? Can you control who you're sexually attracted to? How much does environment influence your sexual preference? "Darryel's Daily Dialogue...where positive words, manifest positive action."