Dr. Anne Truong says low libido often traces to low testosterone or porn overuse. Frequent pornography consumption disrupts the brain's arousal pathways, making real-life stimulation harder. Get a testosterone test and consider cutting back on porn.
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I'm not sure what you mean by mental stimulation because guys, if you're feeling that you are less aroused or your libido is low, you're not as aroused with someone that usually is you're aroused with, then one, get your testosterone level checked. You need to know what your testosterone level is because testosterone affects libido. And then two, if you're watching porn, stop it because sometimes porn will affect your arousal mechanism that starts in your your brain. So shit is now more common, more easily accessible now because you can watch shit on your phone now. It's more easily accessible and shit will mess up with your arousal mechanism in your brain. If you don't get aroused in your brain here, nothing's gonna go down below the belt.