You’re obviously trying to be rude OP, cause otherwise you could have easily answered if they want you to talk about your experiences or actually want to watch as you fuck bulls and/or their friends or want an open relationship where they aren’t involved in your dating, etc. There’s many dimensions to a cuck fetish, but I wouldn’t suggest you do research before commenting.
No, strictly speaking, a cuckold is the husband of an adventurous wife. Watching is not a requirement. A simple Google will tell you that. My point is people reaching out with a cuck fetish aren’t trying to marry you or even necessarily date you, so how are they looking to fulfill the fetish.