Consensual non-consent... Seems a lot of women have this fantasy, my wife included. It's not a ******* fantasy although some women have those also. No, consensual non-consent is more like submission, not having a choice in the matter. Perfect example is my wife could never bring herself to swallow, she has trouble even taking a pill, she has a high gag reflex. That being said, she has swallowed a few times, those times were with her black Dom. She is just getting into her new role as a Sub and he is putting her through her paces. The first time she swallowed his load he had her on her back on the bed with her head hanging over the end of the bed while he face fucked her (another thing she doesn't do normally) and in her words, she felt that when he unloaded into her mouth, she had no choice but to swallow, he was not pulling out till she did. That's only one example but it is a good one because it describes her feeling of helplessness, of submitting to another's will, not having a say in the matter. Anal is another one, she will do anal but only when she wants it but with him, he does not take no for an answer. On the one side, she does not like it but on the other, it's hot and she eventually gets into it. So while it is not always what she wants at the time, it is always exciting for her.
For me, it is exciting to watch and I usually get the benefits as well, trickle down theory. As she becomes accustom to some things, she gets more comfortable and is more easily able to do those things. We are a stag/vixen couple and as we progress into this lifestyle, what she learns with other men, she brings into our relationship. Swallowing is the perfect example, while she wanted to swallow me, she never could, until she was ****** to swallow him. Now she regularly swallows me and she enjoys it, much less messy as well
Being "taken" as appose to "giving yourself" is probably the key here. Having no choice in the matter, submitting yourself to the whims of another without having any control, it must be in some way, liberating. It's also pretty gutsy, being able to let go like that, I can see the attraction.