Bisexual pornography
The female performer may encourage the two men to engage in sex acts together. She may do this by talking to them, or by masturbating as she watches them. In some videos, the woman may demand that her "straight" husband or boyfriend do sex acts with the other man as "punishment" for cheating  (see Cuckold). Usually the "husband" performs oral sex on the other man, or receives anal sex from him.