Trailer park lady who has sex with mentally challenged man?

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My title sounds a little funny, but I remember seeing the trailer (many years ago) and thinking that it looked interesting. Trailer seemed very IFC (independent)...the mentally challenged man wished for a girlfriend when he blew out his birthday candles. He ended up giving a huge envelope of cash to a pretty lady (I think from a trailer park) and she had pity sex with him, but his mental disability prevented her from being with him, even though her boyfriend would regularly beat her up.

Title? Thanks in advance!



Mary Poppins?