My answer will be universal for everyone, not just for girls.
First, define what we call messy relationships (because this usually means very different things). If this is an obsessive state, when you want to stimulate yourself sexually all the time, there will be a lot of energy return. And if a person has sex with a large number of people, but this is normal for him, naturally, consciously and healthy, then he can, on the contrary, accumulate a huge amount of energy and will feel great.
In any case, it is very individual, and each person needs to focus on their own feelings - is it good for him personally or not, fills him or devastates him.
Depending on the energy expended, consume a certain amount of food. Strictly, if you want, you need to measure the energy consumption during sex somehow individually for you. Or you can visit a training on women's energy, they will tell you there))))