sperm questions

When my husbands ejaculates all his little men fall right out... I hold my legs up n my cervix up it still leaks... we try different Postions same outcome.., my husband does ejaculate alot so idk if its because my vagina canal cant hold all his men or if his sperm is too watery... I also have him taking vitamins for sperm and we wanna try other methods to keep his men in place before going to the doctor any suggestions?