What is love, but taking care of each others needs? If your client relationship has gone on for any length of time, you were taking care of one need for sure and probably other in the process
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As long as you are both meeting on equal ground (ie- no one is looking down on the other or holding the past over the other) then why couldn't it work. The 2 biggest things that break up a marriage are sexual issues and money issues ... so why couldn't it work ... FYI in a relationship monetary consideration is called and allowance and not a donation!