Anytime you send a message to your prospects through whatever media you choose. I.E. marketing.
Especially if the marketing ideas, team, products, or service are comprised of only males. Depending on the industry, a females input could open new doors.
*note- I'm a male (in case you didn't notice) and this is from my perspective and in my own experience, I have found inviting female contribution vastly changes things, from minute to astronomical.