My hair has been getting greasy due to showering everyday, should I start showering every 3 days? How often do you shower??

I'm not convinced that showering daily is the cause.  It's true you can overstimulate the sebaceous glands, but a one-a-day shower isn't extreme.  Genetics and hormonal shifts are more common.

I went through a few sites.  Here's a link for you.  Just search "oily hair causes and treatment" for more.

http://www.hairboutique.com/tips/tip1058.htm

Personally, as a teen I shampooed daily and conditioned only once or twice a week. 

As a young adult, I shampooed and conditioned daily. 

Now in my middle age, my hair is dryer.  I shampoo & condition every other day.  On the days I don't shampoo, I rinse well in the shower and condition with a thorough rinse.

You can shower every day. Just wash your hair every day but condition only your ends not your scalp. Also use shampoo and conditioner for oily hair.

Showering everyday will not cause greasy hair. I used to have very oily hair and if I didn't wash it daily it would have just been plastered to my head. I never used conditioner and washed it daily. The only thing that has cut the oil down was coloring it and menopause. Now I wash it every other day and use conditioner.

I love to put off washing my hair lately because I completely ran out of conditioner.. Oh well :) It's not gross because I keep spraying texturizing spray in to make it look good and not smell bad. Invest in a dry shampoo! Batiste is like $5 at your local drugstore. When your hair gets greasy again, spray that in, and keep going until you need to wash it again :) You can also try just rinsing it some days or rinsing and adding conditioner when necessary. When I had colored hair I washed it 1-2 times a week and it wasn't gross. Good luck!