generally speaking, there isn't any harm, as long as you and your partner are both happy with this. Having sex seven or more times a week is considerably more than the average, which is just under twice a week. However, many loved-up couples, particularly in the honeymoon phase, will have daily sex and this reflects the new passion you have for one another. If you're further into a relationship and still having daily sex, many would ask" what's your secret. There are several ways to communicate in a relationship and bonding through sex is a great way to stay connected as a couple.
A question of balance
The only issues would be if one partner doesn't want to have as much sex as the other, in which case the frequency needs to be negotiated. Most couples have to navigate this area at some point. The other issue is if your focus is so much on sex that you have no other way to relate to each other. Sex shouldn't be the only activity you enjoy together.
If you're single, daily sex isn't necessarily harmful, but it does indicate a rather one-dimensional approach to life. And the more sex you have with multiple partners, the more you increase your risk of unsafe sex. There are a few signs that could indicate your daily sex isn't healthy and may border on a sex or love addiction. If you find yourself thinking about, planning or pursuing sex for the majority of the day or night, so that your focus is not on your responsibilities, this is a problem.
Libido naturally fluctuates across the lifespan, and as a reflection of what's going on in your life and relationship. The amount of sex you're having must feel as though it's in balance with the rest of your life. The moment you feel it is unbalanced, take some time to get it back. Your life as a couple will be better for it