Basic Trope: A male character is sent to buy tampons or pads for his wife, girlfriend, daughter, sister, etc.
Straight: Alice starts her period a couple of days early, and just used the last of her tampons. She's running through The Long List of stuff to do, and doesn't have time to stop by the drugstore. So she asks Bob to go get them.
Exaggerated: Bob moves Heaven and Earth to get there, and get the tampons without being questioned by all his buddies (that were there buying condoms), and get them home...only to have Aliceget pissed at him for "buying the wrong ones."
Downplayed: Bob is going out grocery shopping, and Alice adds them to the list before he leaves.
Alice doesn't have time to buy them.
Alice is young, and still kinda ashamed of buying these on her own, so she sends her brother for them to avoid the embarrassment.
Bob is going out shopping, and as long as he's going out, Alice adds them to his shopping list, or he specifically asked her if she needed anything.
Invoked: Alice has been low on tampons, and she puts buying them on her to-do list, but as per Finagle's Law starts three days early. She doesn't have time to get them, but Bob is just sitting there playing video games.
Exploited: Charlie, Unlucky Childhood Friend to Alice, knows her insensitive boyfriend Bob will be reluctant in this area, and when he hears Alice mention she's running low he volunteers to buy more for her hoping to get brownie points.
Alice knows Bob won't get the right kind, and that he won't bother to send a text and ask her, so she just makes the emergency trip to the store herself.
Bob refuses to go. (Although he knows he'll probably get Exiled to the Couch, or outright dumped.)