She doesn,t need to....she infects ten clients , each of them infects five girlfriends , who then infect five boyfriends...are you adding up the numbers..??
Reminds me of the old song:
One day she had a ride, with a sailor from the Clyde,
And she wondered why he held her very close,
But when he finished screwing, she knew what he'd been doing,
For he'd left her with a good and proper dose.
She gave it to her father, who gave it to her mother,
Who gave it to the Reverend John Brown.
Who gave it to a cousin, who gave it to a dozen,
And now its half way round the town.