#ejaculation
/delayed ejaculation
Some men can only achieve {ejaculation} by {masturbation} or during foreplay. Common causes include:
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habitual effect of practising {withdrawal technique} as a method of {contraception}
medications (particularly anti-depressants & anti-anxiety drugs)


inability to 'let go' emotionally 
{anxiety} about sex & ability to satisfy
natural causes (if aged 50+)
lack of sexual desire
{stress}


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As with all sexual problems, a frank discussion is essential. The 'Sensate Focus Technique' may be used successfully (see 'Sexual Anxiety' section). It's important to ensure the female partner doesn't feel rejection. If you can {masturbate} successfully, ask your partner to stimulate you by hand, before entering the {vagina}.