Isn't the term partner reserved for homosexuals?
No - It is the legal definition of a defacto relationship - I haven't heard of it in relation to gay couples - is that what you call your boyfriend CHAOS
Here are some other common definitions of the word partner
noun /ˈpärtnər/
partners, plural
A person who takes part in an undertaking with another or others, esp. in a business or company with shared risks and profits
Either of two people dancing together or playing a game or sport on the same side
Either member of a married couple or of an established unmarried couple
- she lived with her partner
A person with whom one has sex; a lover
A friendly form of address by one man to another
- how you doing, partner?
A timber framework secured to and strengthening the deck of a wooden ship around a hole for a mast