I once "dated" a man from a West African country (dated as much as one can date a polygynist, as I discovered).
When we parted ways after I visited him in the UK (he split his time between home country and UK) he had a camera with him (before mobiles had cameras, late 90s) and wanted to take a photo of me. I found this very odd and inappropriate and mind boggling, given the visit had gone increasingly shittily - mainly because I discovered his polygyny - repeatedly. I thought it was extremely unlikely we'd ever meet again and was stressed and pissed off after the visit. When my reaction was negative, he desisted from taking a photo.
A year or two later I went to teach TEFL in the Far East and my neighbour happened to be from a West African country. He was very friendly etc and I went along with an acquaintance for various reasons. At one point, while in his apt, he brought out a photo album .. entirely filled with photos of women he'd been involved with.
There was not one photo of anyone other than a women he'd dated or fucked or maybe even hung out with.
It was - essentially - a trophy book.
Women being the trophies.
I realised the man I'd dated from the neighbouring country had intended to take a photo of me for his trophy book, especially since he knew we might not meet again.
I think a man who thinks like this - about women and about sex - is not someone you want to be in a relationship with. That's the most diplomatic way I can put it.
I don't know if they just look through them and congratulate themselves, or wank .... Or (having got to know several men of that type from those countries) I'd suspect they actually show each other them.
It's pathetic.
It's objectifying.
It's sex and women as 'conquests" - exactly like op's partner's title.
I found it particularly uncomfortable given that the guy who was going to the a trophy photo of me treated me like shit (though no worse than any woman he involved himself with), seriously disallusioned & almost traumatised me as an inexperienced 22 yr old, and gave me a parting present of an STD.
i imagine the women in my neighbour's trophy book were possibly similarly angry and bitter and disallusioned about their involvement so it's just so ... Distasteful.
It reflects so poorly on them.