How can I stop or (at least) delay premature ejaculation?

[scripps_313_248_online]

I feel extremely nervous of asking this!!! But it has to be done!!! I'm looking to know about ways to stop premature ejaculation every time I'm napping or sleeping and especially any time I wear briefs (or tighty whities)??? It has become that I can't make even the slightest of movements or have the most normal of thoughts without such a thing happening!!! It is really embarrasing and to make matters worse whenever this happens -- I'm stuck masturbating in hopes of getting a long break from it!!! Sometimes it works, sometimes it doesn't!!! Could obesity and being significantly overweight play a role in this as well!?!? Can someone please help me!?!?!?