We donate to charities for lots of reasons: because we're generally magnanimous people, because we care deeply about certain issues or because it's the only way to get Meg to stop talking about the plight of the endangered proboscis monkey.
And for men, there may be another force at play: a subconscious desire to impress the ladies.
Researchers in the United Kingdom reviewed thousands of online donation pages from the 2014 Virgin London Marathon. Runners participating in the marathon usually put up a fundraising page where they can raise money for a charity of their choice. And donations are made publicly, so the researchers could keep track of donors' names and how much they contributed.
It turned out that everyone was a little competitive on online donation platforms: people on average gave about £10 more after seeing others' large donations.
But men donating to attractive female fundraisers were extra competitive. They contributed £28 more than the last guy, on average.
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Source material from NPR