Do you finish too quickly? Try using the Training Masturbator Toy for Premature Ejaculation three or four times a week to train your cock to take its time. Use the toy for three minutes each session to familiarize your penis with the snug, natural feel of a vagina, so next time with a partner you hopefully won't climax too fast and end things before you want.
The Training Masturbator Toy for Premature Ejaculation features: