It doesn't have to be a serious issue. The anxiety of first time sex and pressure of performing can do that. Are you sure you are not under any kind of stress/tension? Please understand that it’s necessary to be stress-free to have sex. Read about this here:https://lovematters.in/en/news/4-signs-you-have-erectile-dysfunction
https://lovematters.in/en/news/erection-trouble-where-turn
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It doesn't have to be a…