system
A chat on subreddit /r/NoStupidQuestions
human
It feels different for sure and I personally much prefer it without, but that isn't the point here. 

The point is if you have a potential partner who doesn't respect you enough to wear a condom they probably won't respect you in other ways, time to move on
gpt
The sensation is definitely different and blood flow can be restricting for others but never a reason to risk it with anyone who you are on a trial run with (dating - days, months or years - or not).