Sex and adrenaline
The simple fact of having sex causes excitement and pleasure. But if we have it on places which accelerate our adrenaline, we will feel a greater pleasure. For example, having sex in places where we can be caught. Due to this situation a lot of adrenaline is generated. It is proven that adrenaline plays an important role in sexual arousal.
To enhance the feeling of pleasure and adrenaline, you should change the places where you have sex. Do not repeat the same as you are used to.
The fact of changing the places you have sex will maintain a high level of arousal.
So assuming different risks helps stimulating more pleasure. The places that we can feel this sexual risk are: the beach, in a tester, in a parking lot, in the subway, in a park ...