Measure the erect penis
Measure girth at the thickest point
Measure length from base to tip
Compare measurements to condom size charts
Choose snug if girth is smaller
Choose larger if girth is bigger
Standard size fits most average measurements
Snug fit if condoms slip
Larger fit if condoms feel tight or uncomfortable
Check package width and length
Test a few brands for best fit
Avoid condoms that roll off or pinch
Recheck size if erection size changes over time