lesbian, gay, bisexual, and transgender

First of all...i though what is this ? i saw in my facebook that quite a lot of people changing their facebook profile into rainbow picture.I really curious of it!

Finally! i just realize that is LGBT flag. "OMG! "This is the first word came out from my mind.BUT　I'm not resist any of them．It's their life, so they can do what they want. 

What will happen to me if i'm one of them?  honestly i really can't accept it if i transform into lesbian.This really will cause much effect to next generation.If their adopt a child, sure their child will follow them.

After 10 years or 20 years...this world will change into what? full of gay and lesbian and all that? Confirm the average of human will decrease and decrease.