A condom should fit snugly without being painful or dangerously loose.
: Most penises fit into Regular/Standard size condoms, which are designed for an average erect length of roughly 5-7 inches and a girth of 4.25-5 inches. Condom Size Guide
Buying condoms as a girl doesn’t have to be a guessing game. While many brands label themselves as "one size fits most," finding a comfortable and secure fit is key to both pleasure and safety.