When you require larger returns, you're willing to accept higher levels of risk (think of all of the pension funds with obligations where they calibrated their returns at 8% but are falling far short of that [1]). The debt for these sorts of transactions is referred to as "junk bonds" or high yield debt [2].
Sidenote: It's very important to understand risk when comparing returns, as returns must be risk adjusted to be properly compared. For example, 5% returns on bonds and 5% returns on equities are not the same based on the underlying risk of the asset class.
[1] https://www.bloomberg.com/news/articles/2017-08-02/5-is-the-...