If you're talking about sex products, you wear them pretty much the same way you would any product: by clicking on then in your inventory. However most sex products have extra requirements like most trigger dicks make you wear 2 products to work or they rely on a piece of furniture being loaded in the room.
Check out our Black Market full of sex products here:
buysell/black_market_index.php?mode=viewuser&user=2If you find anything you like instructions will be given to you on how to wear them.