Our expert says:
I'm not sure whether or not you are actually already experiencing pain; if this is the case then all you need to do is to let your boyfriend know when he is too deep and he will have to control his thrusting to make it shallower. If he struggles to do this you may need to put something over you (eg. a small cushion) to reduce the depth of penetration or use the female superior position preferentially as you control the depth of thrusting.
As regards his penis getting bigger - I'm assuming that you mean longer. My understanding is that it will appear longer (due to some dropping weight around the pubic area and base of penis) but will not actually BE longer. The other factor is that if he has lost weight around his stomach, he is closer to you now (the stomach before was like the cushion I mentioned earlier), so it's not that his penis is getting bigger, but that he is getting closer...
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