It is no surprise that given a limited amount of space in a bathroom shared by two people, the more female of the two will just take up more space. Period. End of discussion.
And the less said about it to your partner in the bathroom, the better. In fact, if you’re smart you will never say anything at all about it other than something along the lines of, oh, “I love what that Chanel No. 5 does for me when you wear it.”
Trust me, you want to get over it and find a drawer or somewhere else for your stuff and live to fight a battle you might just be able to win.