Our expert says:
Okay, you've asked a few questions so I will try to address them one by one:
Regarding your b/f's soft erection, if he has problems with losing his erection during foreplay or other stimulation too, then he probably need to have a medical check up to make sure that he is okay physically. If he comes back with an 'all clear', or he is able to become and stay hard at other times, it is likely that he is suffering from performance anxiety. This is due to the pressure that he, you, or both of you, put on him to 'perform' well sexually. In this instance he could either get a prescription for something like Viagra, Cialis or Levitra from a doctor, or you could both see a sexologist for assistance.
Regarding his size, is it that he is soft and therefore not fully erect? Most men have a penis of about 10-12 cms in length and round about the size of the circle you make when you touch your thumb and index finger in width. Given that your vagina is soft supple tissue surrounded by strong muscles, it shouldn't make much difference if he IS smaller than this - if you think about it, tampons are much smaller than this and they don't fall out! What you can do is practice tensing and relaxing your pelvic floor muscles (kegels exercises - see www.sexuality.about.com/lr/kegel_exercises/45057/2/) and then do this during penetrative intercourse, it can improve the sensation you feel and potentially also tone the muscles a little to hold his penis firmer.
Finally, regarding keeping him inside me, it may be a combination of the above that contributes to this, but it may also be that he/you are thrusting too long a stroke and the penis is leaving the vagina. Try shorter thrusts - this can also be very stimulating.
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