ask her stop usin expensive shampoo, give her a bar of soap

is soap got better use for guys?

reminds me about the prison joke... a new prisoner came to the
prison, then bathing time, another prisoner drop his soap and pick
up... the new prisoner starts raping him from behind and says,
"haaaa, never pick up your soap next time...".... those other
prisoners saw what's going on and say, "haiyah he is gay he always
delibrately drops his soap..."