Viens on penis...???

hi, i am a worried man of the age 24, ive never had big viens on my penis before, untill about a couple days ago, i was goin to the bathroom when i had noticed that theres a pretty big vien on the right side of my penis thats now very visible, like its popin out or somthin...? its never been there before, and i am a very sexual active person with my girlfriend, i dont think shes noticed it yet, but i get very paranoid over such matters, espesialy one about my penis...i know it says everywhere that havvin viens on the penis is normal, and i even read some one case that was almost the same as mine, n there result was that there normal, soo, if im normal, what could have caused this vien to be so big all of a sudden? iv'e seen plenty of porn video's, n yes i have seen men with alot of viens on there unit, but like i said, i never had such viens before, will it go away? cause its not lookin like it right now, should i be concerned, or should i just accept the new look of my penis? please help...im terribly worried. ty in advance

A worried man   :(

[Kouta]

I have a big vein on the lower right side of my penis. It gets annoying sometimes when i fap furiously, but i dont think you should worry. If it suddenly got bigger than it probably will get back to being small soon. I bet if you expose it to cold temperature it would shrink back.