What the OP is describing is so normal. Don’t worry about it. We read things on the internet and start to convince ourselves we have a “problem”. There is no problem here. Some guys stay erect without stimulation and others don’t. There are probably many factors involved, such as age and health etc. If everyone who logged into TP in the last 24hrs antucally read this thread and posted if they have similar epxeriences with erections, the thread would already eb several pages long, as it’s perfectly common.