My ex was the first one I tried this with and he had huge loads of absolutely foul cum. When I watched porn with the ladies swallowing I would gag. I really had no idea the taste or amount could vary. So when I eventually got a lover (5 year dead bedroom thing) and he asked me to I was dreading it but he had mild taste and less volume, it was fine. Nobody since my ex has been that awful tasting. He was ridiculously fertile too, and most all the guys since have vasectomy, which makes me wonder if it's the literal sperm that are so gross.

So basically it was worse than I could imagine the first time.