True to a very large extent.
Certain married men - submissive, cuckolded, often white married men - find themselves in situations - a cuckold marriage or jail/prison - where they have less control over their lives, marriages, wives and sex life, etc. than they might wish. They often find themselves in need of a "patrone" that can help them control their environment for them, provide security, stability and certainty, and make sure that they can maintain some status quo in their lives. It is human natural to expect men of power to expect and accept some quid pro quo in exchange for these services - "service" in return.
Most dominant men - even if they are straight, which most are, will allow the cuckold to step someplace quiet and even private to do what they need to do. They understand that this might be foreign to them at first, and they might need some patience and understanding while they get in the rhythm of things and provide what the bull wants from them. Just do what you need to do, don't get hung up on the labels, sights, smells or tastes. Do a good job, thank your new Patrone for the opportunity and his patience, get cleaned up, rinsed out, and go about your business. Most of the time, no one ever even knows. If the gentleman that is seeing your wife wants anything from you again, he will probably be very discrete and gentle on successive occasions, if somewhat more demanding in his expectations.