I am 36 years old and have been experiencing a lot of issues with periods. However I have notice that anytime I have sex I bleed. What is causing this?

Postciital spotting. Several things can cause this. A abnormality (dysplasia) of the cervix, infection or vaginitis/cervicitis, a polyp, a tear or laceration from vigorous penetration, reaction to lubricants if using them, etc etc. First thing, get checked out thoroughly by your obgyn to rule these things out.
Med eval. Bleeding during or after sex is not normal. There is an array of possible causes. Please see your gynecologist for assessment.