Spotted hyenas: the female is bigger and stronger than the male, and definitely wears the trousers in pack dynamics.
Birds of paradise: the males grow amazing plumage and dance for the females, and the females, who are notoriously picky, make their choice from the dancers.
Bonobo: I defy you to pick a time when a female bonobo *isn't* consenting.
Metellina Segmentata (a species of spider): she is so dangerous to him that he wraps her in silk first. However, this is clearly a ritualistic rather than a functional binding because once the mating is complete, she frees herself from the silk.
Queen bees, ants etc.: she's many times the size of the male, and is responsible for the very existence of the hive. Her consort is tiny compared to her. In fact, in ants, the female invariably produces females if she uses his sperm, but if she decides to have any sons, she doesn't need any. In other words, her sons are genetically identical to her. I bet you alpha male wannabes hate that little fact, don't ya?
Seahorse: female consent isn't the issue; male consent however, would be. Famously in seahorses, the male is the one who gets pregnant. The female still produces ova, but she inserts them into his pouch using her ovipositor.
Tamarins: here's one that's going to set off your cuck siren, universal! Different species of tamarins have different combinations of family structures, but the most common is one female and two males. While this doesn't make any statement about consent, I thought I'd include this just to piss you off. Bon appetit!
Side-blotched lizard: the males come in three types: big and strong orange-throated, smaller blue-throated, and yellow-throated, who look like females. The orange male keeps a big territory and as big a harem as he can. However, the females don't unanimously like this, and many will choose a blue male instead. Yellow males sneak-breed with the orange's females, and while this doesn't necessarily indicate choice on the female's part, if you've ever seen red deer during the stag rut you'll notice females occasionally running off from the big, shouty males to sneak a mating with a smaller guy at the periphery. They're definitely choosing, and I wonder the same about the bored females of the orange-throat.
Ruff (a kind of bird): they too have three types of male: big territorial males, satellite males, and 'faeder' males. Territorial males establish territories, but the females don't particularly favour the big males. The satellite males and faeder males hang around in the territorial male's territory and sneak-mate with the females who come to the territory, but he tolerates them because the presence of these smaller males attracts more females (nobody's sure why, to the best of my knowledge), so in essence the territorial male benefits from the smaller males' more magnetic qualities.
Furthermore, the other males mate with the faeder male, both with them or with him on top.
The females are incredibly promiscuous and generally prefer the faeder male above all others, and the territorial male the least. They very much exercise choice over which male they will mate with.
Need I go on?
