An old tramp approaches you in the street, he/she reeks of alcohol and is mumbling incoherent rubbish. Would you rather walk away,as quickly as possible or stick aound and see if there's anything you can do to help?
I'm not too sure about the "true love" element, but I think I would rather have a stable partnership that lot of casual flings.
Badly hungover, you wake up one morning in bed next to a complete stranger of the same sex and it's clear they find you very attractive(or in the case of a homosexual - a member of the opposite sex).
Would you either, make your excuses and rush off, or stay around and see where the moment takes you?