 [ Symptoms ] why do i now have a lack of sensitivity in my penis it is not numb but takes a longer time to achieve orgasm  i do not have difficulty getting an erection i have plenty of energy throughout the day and t tests ok i have not taken medications for 4 6 months celebrex percocet tramadol effexor i currently take 2000iu of vitamin d daily vaginal intercourse works fine but oral sensation lack of is what seems unexplainable to me  over the last 2 5 years i have had a few cortizone injections in my shoulder and knee but no major injury to my back [ Disease ] flu or not your body still needs oxygen perhaps even more so when you are ill use the cpap breathing in moisture never causes illnesses flu and colds are caused by viruses