Theres realistically only beneficial things to say how sex life improves bodybuilding. The only negatives I could see is just being too tired to do one because of the other.

Man if it wasnt for sex id go crazy during competition prep.

The market itself shows the merging - male porn stars are usually bodybuilders, a number of supplements are also adding in a libido effect, etc.

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I can do everything through Him who gives me strength.
-Philippians 4:13