Male and female differ widely in terms of of sexual responses, male gets quickly aroused and female takes longer time to get aroused, male reaches climax quickly, its physilogical and normal, but not ideal, to prolong sex duration man has to work hard, he has to slow down mentally, by diverting mind from situation, and learn ways how to delay his reflexes. One idea is to stimulate the partner by foreplay to near orgasm sate
and pentrate. Count number of strokes if it is less than 45plus minus 15. Means (30 to 60) then seek medical advice. If satisfied ok otherwise inform.