Okay, let's get serious. Now, your selling point may be your magic, but as a sex shop you're going to want to be stocked with some more mundane items also. Build up customers loyal to your cheapish things. I'm going to start with the 1cp - 50gp price range.
Hygiene: Perfume can help disguise this, and you can offer them at a wide range of prices. Check the Arms and Equipment guide, or something more recent for prices. A pound of soap is 5sp. Scent it and sell it in bars of an ounce or two. In terms of magic items, an anything of prestidigitation will let you clean and flavor (mm, you taste like strawberries!). The unguent of gentle repose equivalent should you have any necropolitan customers who are somehow still interested in this.
Birth Control: Condoms. Make them of oiled silk paper, lamb intestine, tortoiseshell, animal horn, linen soaked in an alchemical treatment, animal bladder, or even leather. No clue on pricing.
Pathfinder SRD also lists imbibed methods of birth control, being Night Tea for females and Bachelor's Snuff for males, which is much cheaper than the magical birth control spell found in Book of Erotic Fantasy. Find out if you can steal
them.
Disease Prevention: Condoms again, but also a certain metal... Targath. Any targath whatsoever carried gives a +2 bonus on fortitude saves against disease. A sling bullet of Targath costs 3.01gp; you should be able to make small charms, cock rings, nipple clamps, and such for reasonable amounts. Magically speaking, some manner of Resistance effect would be useful, particularly if you can improve the duration.
Fun and Kinks: Dildos of steel, glass, and leather are best of mundane materials. See if you can come up with other fun things. If you're feeling fancy, put a little targath into the steel ones. Cold iron could be marketed to frustrated fey/demons with masochistic urges, same alchemical silver with devils/lycanthropes; but those are niche markets. Grab some rope hemp, silk, and earthsilk if you can. Gags, blindfolds, nipple clamps, etc. are fine. Magically speaking, there is a first-level spell with a perfectly reasonable duration at caster level 1 ... Mount. Just watch out for the liability there, and check if bestiality is legal in your plane, acceptable in your religion, and does not conflict with your Good alignment. An item of alter self is lovely, if getting a tad expensive. Disguise self has an unfortunately low duration as a potion. Water Breathing could be fun.
Other: Item of Rope Trick for anytime, anywhere fun. A little on the expensive side.
Services: One circumstance in which investing in a command word or continuous item may be worth it. Make sure to have Prestidigitation / unseen servants around to clean the place between uses.
- An animate rope spell might be enjoyable here, for your knot-loving clients.
- Silent Image or Minor Image might be fun, but I'm unsure how to implement it.
- Plain old casting Rope Trick.
- It's mind-affecting, psionic, and 3rd level so a bit expensive to item, but I absolutely fuckin' love using False Sensory Input (Touch) to make interesting and enhanced sex. Forget the ban on enchantments and find a way, it'll be worth it.