Try to convince Sally to not use a condom

You try in earnest to convince Sally to let you fuck her without a condom. Replying

with how it will be safe the first time, that you will pull out, and that girls never

get pregnant their first time.

"Well," says Sally. "I don't know." She looks unsure, and glances at her twin to

see if she has any answers. Seeing nothing helpful in response, Sally begins

to think real hard.

...

You have a fifty-fifty chance of convincing Sally.