Let me guess- you're not that old, right? Less than 30?
When you're younger, there is a real embarrassment factor that controls what boys will do/ not do. It's highly unlikely that the average teenage boy will be purchasing feminine products out of fear that someone will think/ accuse them of needing the product for themselves. College boys aren't much different. (Which is odd when you consider what boy behaviors that they will actually participate in, yet buying stuff like tampons is to what their conscience objects. Boys are weird.)
As a consequence, the womens have learned to stop asking. As both genders mature, the boys (hopefully) get over that 'they're all gonna laugh at me' phase and stop caring (hence the propensity to wear flannel, sandals with socks, crocs, man jeggings, etc). Only, they don't tell the womens about the change so the ladies don't know it.
Take a short break from ST and read my blog:
http://tri-banter.blogspot.com/