What Causes Erectile Dysfunction?

sir,i am 35 years old male,last month my family was gone out of station for 15 days,i have done sex with my maid in between 8 times in 10 days,i havent taken proper diet due to family was not there,i also go to gym daily at that time,now when my wife comes my penis is not standing from last 10days,i am taking good diet from last 10 days as my family arrived 10days back.i am afraid that is it possible that maid has mixed something in tea or coffee which effects my sexual health