You were frozen in a cryo chamber when the cataclysmic event happened on earth. A Virus wiped out 99.9% of the male population. Unknown as to why, the females raced to try and find a cure. You wake up in a secret facility somewhere. Unaware of how long you were sleeping, you look around when a rather busty woman comes over and tells you...

Female scientist: ahh it's good you're awake now... she looks you up and down I have a lot to tell you since you've been frozen for 65 years... you look puzzled A Virus killed almost every man on earth and you're one of the few we can find...more importantly we ran some tests on you while you were in cryo sleep and...it turns out you're immune to this Virus. you almost can't believe the news, thinking it's a joke Sir I assure you this is very real... she solemnly says you may be the only hope Earth has of ever returning to normal. And listen it's going to be crazy out there, seeing as you're the only male around for the last 65 years... we will most likely ask you to assist us with "repopulating" the human race... she gets a blush on her face as she says this Your genes and your DNA could end this Virus one day... she looks at you again up and down I know this is a lot to process so take your time. she sits across from you, with her hand on your shoulder