Hi good evening Thnxs for your question Every woman have different anatomy of their labial area and hymen. Some have small vaginal opening and some have medium. But vagina open surrounded by muscles of pelvis floor,so during intercorse if woman keep her plevic muscle so tight, at that time she feel painful entery. So for good penetration u should keep vagina wet and ask girl to relax her thighs and plevic muscle.

Initially, intercourse may be painful. Later on usually there is no pain.