How can we justify behaviour? Also what do you mean by justifiable? Jake2008.
Ever hear of William Glaisser? (I'm not sure I spelled his last name right.) At any rate, it may appeare that, according to choice theory, he is trying to fulfil he last need, fun, as well as his second to last need, power/ significants.
Then there is the neurological aspect, the dopamine high that he may get from it. Because they did this, and like he says, their sexual relationship consist of a lot or a fair bit of anal sex, I don't find this behaviour entirely unreasonable. By that I mean that it is logical to see why he might do that. He is the dominate one, she seems to enjoy being the submisive, they have sex and that produces dopamine, and they associate that kind of play with sex, and their for pleasure. The question is, does she like it, or is it causing her to dislike the sexual behaviour?
Then there is past behaviours that influence such behaviour, such as rape, child abuse, sexual confution, early child hood developmental issues, and so on. A child's development is a big factor in what their adult sexuality will be like.
I'm not sure justify is a fair word. Justification implies something wrong, and I know that's your opinion, but you just left out what you meant by justifiable. Did you mean it as in it's imoral, or there is no reasoning for it? I was just wondering?
Peace and kindness.

