Ever read about Oedipus?

that's natural you shouldn't be bothered

Luckily you’re German, so I won’t have to explain what a doppelgänger is.

Have fun boning your mom’s doppelgänger!

well they always say that men date women who remind them of their mothers. you may not see it right away, but its there

And now you'll never un-see it...

You'll be fine. Just don't call her Mother. Especially in bed.

At least she doesn't look like your friend's dad.

This happened to me in college... My dad pulled pictures out of my mom young, skinny, and hot hot hot. It was like looking at my then girlfriend. The creepy part? My girlfriend and mom had the same name (middle too). And no, I didn't end up marrying my mom. My wife, however, married her father...