Would you make a deal to help a guys health?

Okay so me and my buddy were talking, he was telling me about how his doctor said he needed to lose weight or he could die, I found it disturbing how flippant he was about it, he said he really doesn't have anything to live for. he's incredibly shy and doesn't have the confidence to approach women he's a pretty open guy he's only had sex 3 times and he's 33 years old. This is where we came up with the weird idea find a woman who would have sex with him if he reached his weight loss goal like loss 15 pounds, I recommend paying her like 50$ a month until you reach the goal so she actually has a reason to go along with it, he was thinking about looking on Reddit or Craigslist for a person. So what do you think this may save my friends life is this something you would do? What do you think about it?
Would you make a deal to help a guys health?
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