Well DW watched this happen to her last male graduate trainee and it happened quite a bit with a common pattern in her firm. It worked like this.
The young male graduate trainee brokers and traders were all 'prospects' for the female desk assistants who to be fair were all intelligent women but not with less good degrees. Everyone in teh City knows the value of money though and is intensely interested in it.
Pretty much the standard mode of operation was that the female desk assistant would go out to dinner with a 'prospect' a few times, he would pay of course. After sealing the deal she would put an initial bid in for say a Channel hand bag, he would pay. This was a test of his commitment. They would then be a couple.
This would go on with the bids getting higher and higher until bonus time. Then he got a big bonus and it would carry on with perhaps her moving into his docklands apartment at some point.
The young male trader/broker eventually married the desk assistant after she had made it very obvious that was what she wanted and a huge ring would be produced. Any refusal usually ended the relationship. Each stage was a test of commitment. In the case of my DW's graduate trainee and his desk assistant, they are a nice couple, in love, but she certainly knew what she wanted and she made sure she got it. This pattern was repeated several times as observed by DW.
Occasionally, a 'prospect' failed to get the expected bonus and several desk assistants switched horses to better prospects. Of course, the 'prospectve males' of course liked flashing their money (as Miggsie says) so it was pretty obvious who the better prospects were. I am not saying it was the only criteria but money was on the agenda for these women. Of course the 'prospects' has their agenda too so it was not one sided.
Seen it happen myself in a different context with women who hang around the City bars hoping to snag a bloke. It happens the same way to Premier League footballers.
Not judging anyone - just saying how it is.