 [ Symptoms ] i try to put on a condom and then penis when flaccid i never had sex before i am 29 i used to feel a larger vein that i do not feel anymore [ Disease ] are you saying that when you put on a condom your penis becomes flaccid or did you start having troubles after you put on a particular condom the lack of a large vein you are used to feeling could be due to a decrease in blood flow   or erectile dysfunction   or anything that might prevent your erection from hardening fully