it does depend on your definition of partner too? I had a fb with whom I had good chemistry, we did stuff (out of the bedroom) together as well and were together for around 8 months or so, it was pure physical attraction and sex kept us together.
When I met my current bf, yes of course there was physical attraction initially but over the months that's turned to emotional and mental/intellectual attraction too and I see the whole person and that's who I've fallen in love with.
I have a previous ex, whom I was with over 8 years and even now another 8/9 years on I still think he's an attractive guy - because he's fun, intelligent and still fit and it wasn't attraction that caused me to split with him.
Another ex before that I look at now and feel no attraction to at all, but that's not because of his physicality, but due to how arrogant and pretentious he's become.
I look at my brother who's been with his wife over 30 years now and he still talks about his wife as the 'girl who sets his heart on fire' and you only have to see them together to see how much they love each other even though both have wrinkles, have got a bit thicker around the waist etc.
That's not to say, for me at least, that there aren't things that drive me mad about my current and previous partners and I know that I do that have/do drive them mad too - but that doesn't stop the attraction, its just part of life??
my thoughts anyway