Previously in this thread I got this idea of propose to your gf
when you are havin sex
http://www.sgforums.com/?action=thread_display&thread_id=283643&page=0
Now I got another idea of proposing.
When your gf is sleeping, put the ring into her panties.
When she wake up that time, she wil feel pain in the vagina as the
ring will rub against her vagina in her panties.
Than you tell her "Honey. I think your vagina pain because you
horny lah cos I very long never have sex with you already so now
let us have sex than it won't be pain anymore".
Than you take off her panties and the ring drop out. Than you
propose to her. After she accept, you say "Let us celebrate this
happy day by having sex" 
Than she not only accept your proposal but also have sex with you.
Kill 2 birds with 1 stone 
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