best to stay away from oil-based lubes, as these can irritate delicate tissues.
They’re not recommended for vaginal use. That said, a gal’s best bet in
handling a big penis during vaginal intercourse is to make sure she’s fully
turned on. The two of you need to engage in plenty of foreplay, giving your
body at least 20 minutes to become aroused. This allows the vaginal canal to
lengthen, giving a longer penis more room (otherwise, it can bang up against
the cervix, causing pain). If you’re not lubricating well or want things
wetter, use a lube, as this will make any width issues more comfortable.
Finally, practice Kegel exercises, as toning your vaginal muscles will give you
more control over the situation.