Common types of sexual dysfunction: erectile dysfunction 1. Generally speaking, erectile dysfunction is mainly related to the lack of hardness or abnormalities of the penis erection during sex 2. Hardness grading self-assessment of the severity of the condition Hardness grading Severe 1: penis only swollen but not hard Moderate 2: penis hardness is not enough to insert the vagina Light 3: penis can insert the vagina but not firm Normal 4: penis can insert the vagina and firm