hello doctor, i am 21 year old. i have problem related to sex. my penis and both my testis are small (as compared to data available for normal size in wikipedia). i am also underweight. i weight 42 kg compared to my height being 5.5 feet,  and less muscle growth. i fear i have testosterone deficiency. please help.
Degree understand your concerns went through your details. Inadequate production of testosterone is not a common cause of erectile dysfunction. Low testosterone can cause the following physical changes