I used to be a 2 pump chump. My stamina was crap, and that's a big part of why I went from swinger to cuckold. I just couldn't hold out long enough to please a woman.
Fast forward 15 years. My wife's Primary Bull breaks up with her to marry a vanilla girl and we drift back into couples-swap swinging. Only this time I start taking sildenafil tablets (generic Viagra) before playdates.
Not only does sildenafil give me a proper boner, but it absolutely increases my stamina!! I didn't know it did that but it does for me now I can fuck for 20-30 minutes rather than the 20-30 seconds I used to do.