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Think of your body as a temple. In the Bible we are told that God doesn't dwell in temples built with hands. He dwells in your temple, your body, if you invite Him in. You have gates to your temple, and they are your eyes, ears, mouth, anus, and male and female parts.
Gates to Your Body:
Mouth - Demons often gain entrance through the mouth. The most used way is your words. Cursing and blasphemy are instant grounds for the demonic.
Ears - People like to say 'it's all in your head,' but the reality of the situation is it's in your ears. And accepting what you are hearing also gives grounds to the demonic. Also, a lot of people give grounds unknowingly by the music they choose to listen to. Lyrics can compromise your spiritual gates and give grounds to all types of demonic afflicted problems.
Eyes - The Bible says, behold no evil thing. When we watch evil on TV, movies, video games, etc., demons can gain entrance to our bodies through our eye gates.
Anus - One of the main gates the demons try to enter through. Through anal sex, you are breaking God's laws, which has spiritual consequences regardless of where society stands on it.
Male and Female parts -Masturbation, or any kind of sex outside of marriage, or any form of ungodly sex (ie. oral, anal, etc) gives the demons an opportunity to enter through the private parts.
Please remember, you would never leave your physical house unlocked so thieves can break in, so you should guard your spiritual house the same way. (Luke 11:24).