How far down the penis does a condom need to go for it not to be a problem? How much room am I meant to have? I know technically one size fits all, A condom can be super stretched but it's not the safest way surely. I'm just thinking if I need to go for a larger size or not, if i do then I'll have to buy online. I'm still a virgin but me and my girlfriend are kind of started to get into sex. Edit: I've got between 1 and 2 inches at the botton.