Original: Producers who use the term "bisexual porn" are most frequently depicting what a bisexual or bi-curious man might wish to see—sex acts between a man and a woman, as well as between two men.
Simplified: Producers who use the term "bisexual porn" are usually showing  what a bisexual or bi-curious man might wish to see. Sex acts between a man and a woman, as well as between two men.