Do you mean cum on the gusset of knickers/panties? I once saw such pictures at a site called The Cuckold Place.
I also like stories on this site, where the woman walks back to her marital home with her lover's cum leaking out onto the gusset of her knickers, or when her husband finds her knickers in the laundry hamper with his rival's cum leaked out on them
Cum anywhere on a woman is good, from pooled in the bottom of a pair of panties to drippings from a messy blowjob on a blouse or tank top, Cum on a woman is a good thing.
