hi,i've been with my boyfriend for a year and six months now, and we are having a problem during sex! i'm maltese and i don't know how to talk good english so excuse me for some words.after 5 min from when we have sex my boyfriend's penis(sleeps)isn't erected anymore, and i dont know why! could this be because he's tired?he spend the whole day in the sun because of his work! thanks and sorry for my english.