First time I had sex with my girlfriend, was hard for me to maintain the erection, such a big disappointment for her. Next time she asked me to take a pill; she knew I work under too much stress. Took Sildenafil (Kamagra Fizz), 100mg. Worked so good. Had sex almost all night, she was so happy about it. Effects lasted until the next day. Side effects, only some chest burn and crazy heartbeat. Men, talk your woman, helps a lot with the communication and have confidence. I'm 34.