I have been reading the previous posts on cialis and viagra but there is nothing about side effects. I am 21 years old and I can get it up easy and I have a great sex life. I want to take cialis just a couple times a month if that for extremely good nights of sex. Will this mess me up later on? I dont want to take it if it will mess me up later. I am afraid if I take it then I will start having to need it. Anyone with experience?