Hello! Let me explain what the Catholic Church teaches about sexual morality like you're five:
The Catholic Church says that sex is a special and sacred thing that should only happen between a married man and woman who love each other very much.
Now, let's talk about some rules that the Church has for sex:
Firstly, the Church says that it's wrong to have sex before marriage. This means that you shouldn't have sex until you're married.
Secondly, the Church says that you should only have sex with your spouse. This means that you can't have sex with someone who isn't your husband or wife.
Thirdly, the Church says that you should never use contraception. This means you shouldn't use something to prevent pregnancy when you have sex.
Lastly, the Church says that you should always respect the dignity of the other person during sex. This means that you should treat the other person with kindness and respect, and not use them just for your own pleasure.
Now, I know this might sound like a lot of rules, but the Church wants to make sure that sex is always treated with love, respect, and dignity.