The problem is that I buy the item and it doesn't show up to equip it.
Hi Nemesis! I am currently having the same problem and I found out that if you, during the tutorial, used the horny spray more than once then you'll have NEGATIVE horny sprays. So when you buy more you will just increase your horny sprays while it is still negative which gives you nothing (since it is smaller than 0) (I am currently having -50 horny sprays)