Just curious, but why do we, as adult webmasters, limit what we upsell to products/services that are adult only?

I mean it is people we deal with, department stores and box stores succeed because they offer a variety of items.. i mean look at the supermarkets, people go there for food but now you can buy stockings, drugs, magazines, do banking, etc... so why do we limit to just adult?

If its penis growth stuff, why not cologne too? shower needs?

Curious is all, but I'd be interested in hearing why those items get excluded.

Ian