Forbidden fruit

/fəbˈɪdən fɹˈuːt/

Forbidden fruit

a pleasure or enjoyment that is enticing yet regarded as illicit, especially sexual indulgence

Examples

1. After being told not to read a particular book, Susan found herself more curious about it, as the forbidden fruit is the sweetest.

2. I have tasted the forbidden fruit.

3. Perhaps it's a forbidden fruit effect.

4. But now the forbidden fruit must be tasted.