I am sorry that you don't feel comfortable enough to tell your parents your orientation but understand. I am Bi and my father figured it out but my mother just knows I am currently single (truth). I do see where this could complicate things too especially depending on how knowledgeable your parents are about GLBTQ stuff.

I am also a bit strange as a parent. If my child is younger and/or unmarried I would prefer to know that they are sexually active so that I could support them doing it in as healthy a way as possible. But I taught parents how to talk to their kids about sex as part of one of my jobs. Now, older generations having sex THAT I don't need to know about!!!

Possible TMI warning...

I will never forget the summer after I graduated college. I stayed with my pastor and her husband for the summer before going off to grad school. One morning over breakfast my PASTOR looks at me point blank between bites of toast and oatmeal and says "Can you go visit family or friends for the day we are really wanting to have sex today" OMG! she was my pastor, a mother figure and over 60 WTF???? Ahh... the naive thoughts (or lack there of) of "childhood"! That evening I DID call before coming home... She laughed and asked "at our age do you really think we could keep it going that long?"... I waited another hour or so for the blushing to die down before going home.