The frequency of sex goes down with the length of marriage. Men get bored/tired and women get headaches. For anyone married over 5 years, be happy if you can get it once per week.
Heard this in high school:
“The first year you’re married, every time you make love together, you put a penny into a gallon jar.
“After the first year, every time you make love together, you take a penny OUT of the jar.
“You’ll never empty the jar!”