Anyway, I think you should just sit her down on day, and calmly tell her you have something to tell her.  I doubt you can hide it from her for long.  She'll start noticing how you've never had a girlfriend or gotten married, etc.  It's best to tell her early than to try to hide it and having her find out later.  Just be honest.  

She isn't against homosexuality, though is she?

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Look up from the sidewalk.
Please.

My lover