An engagement ring

You're half expecting to walk into a stuffed mounted monkey with wings and a horn, but there's nothing as morbid aside from the owner's face. You see gemstones, jewels, strange gadgets, old sculptures, all sort of things that would amuse if not amaze you if you weren't currently so sullen.

Until your gaze catch a shine and you come closer.

It's a golden ring. Nothing special about it, it's pretty plain without engravings or enshrined stone, a regular circle ring. But for some reason, maybe because its normality make it looks paradoxicaly strange among all those extravagant trinkets, or maybe because of some unseen **** guiding you, you want it.

"Excuse me," you say to the owner, "could you talk to me about this ring?"

The grumpy old man point at the sign saying that he won't answer any question. You sigh and take a look at the notice.

The engagement ring, it says. Ancient artifact from some european nordic country. As long as you wear it... You suddenly focus on the text, as what you just read got you way more interested. As long as you wear it, you can exert a magical influence over any woman you want as long as you have sexual desires for her, simply by pointing at her with your finger. Once 'marked', said woman is willing to do everything you ask from her as long as it involves either having sex or strengthening a relationship with you. You can use on several women at once, and they won't get jealous of each other as long as you don't stop giving them attention. When havint sex together, their fertility and your will also be increased and all birth control will be ineffective.

You don't read further. That's it. That's the thing you were looking for, even though you didn't know it until now. This ring solve everything, you can settle down, have real relationships and kids, and at the same time NOT settle down and continue having fun with as many women as you want.

You barely look at the price and pay the owner more than one thousand bucks without blinking before rushing out of the shop, eager to test your new toy.