right, you are proving my point, it isnt animal to be monogamous or accountable in a relationship, it IS however what has enabled humans to facilitate monogamy and the family unit as we know it today... i never made any 'do it like animals' assertion, that is a contrivance on your part... my assertion is that in functional monogamy, partners do have responsibilities to one another, and if one or both of those partners are normal healthy humans, then part of those responsibilities are sexual/intimate in nature... ask any couple who's 'made it', who has been together for multiple decades and you will find that the one thing they all say, the one common ideological denominator with regard to relationships is that it is JOB, with RESPONSIBILITIES, love... it's great, it's the best sensation known to man, but it waxes and wanes, and over any 20-30-40 year period, there will be times for both you and your mate, that youd really honestly rather NOT be with them, that you would LOVE to leave the relationship, but you just don't, because that's your job, of course the feelings come back and things get better again, but it waxes and wanes... love is an act as much as it is a feeling, if not more... commitment is what keeps relationships together... taking care of your responsibilities in the relationship... if your partner is a functional human, then some of those responsibilities are sexual...your duty is to love them, i agree, and part of loving them is being there for their natural and physical needs... like sex... if someone neglects you sexually on a habitual and/or extended basis, then they aren't 'loving' you, people who see love not only as a feeling but also a responsibility don't feel like being neglectful of their partners needs is acceptable...
also, plenty of female cats yell, scream, tear through screens, jump fences, risk life and limb to be able to go get some... so your dubious animal comparison is pretty moot here...