Cuckolding, cuckolds, and cuckoldress behaviors are as broad as the spectrum of individuals involved.
There are no hard and fast rules. I'm not a fan of labels. That said, by the semantic, technical definition, because my wife has sex with other men, I'm a cuckold. I still enjoy regular, frequent sex with my wife, including one-on-one, as a traditional couple, MFM, FM+, and voyeuristic encounters. She also engages on her own, "dating," meeting men during business travel, etc. I still engage on my own, including two long-term affair partners, and other sexual encounters.