Women's preferences aren't artificial constraints (I would stress that they are a fundamental regulating factor in human society), but in a UBI world they would be made artificial. In a world with cloning and surrogacy, they will become irrelevant constraints. If there are unlimited resources, there is no need to select for a suitable mate, so this skill will be unlearned.
Humans don't reproduce like e. coli, but in a UBI world that is the kind of human you are artificially selecting for. Ordinarily, bacteria aren't antibiotic-resistant, but exposure to antibiotics generation-over-generation changes them.
Show me the incentives, and I will show you the man they create. Like it or not, Humans are animals. We have the same primal motivations as other animals, just a more complex expression of those motivations. I think you focus on the details of that expression to lose the big picture, which is incongruent for your personal desires of being free from material constraints.
Life, like art, is defined by constraints. The meaning of our lives is to heroically struggle against them until we fail. To remove the constraints is to denature mankind. The process of evolution is nessisarially actuated through suffering. We naturally struggle against constraints like hunger, disease, and so on in an individual scale because this is what gives us meaning. But it would be a mistake to overcome these on a systematic scale, as it would rid of us of meaning. The future you propose is mankind wireheading itself.