In the case of my ex-husband, it was nurture. His dad cheated on his mom for 53 years without repercussion, so all the kids (male and female), cheated on their partners. Unfortunately for all of the them, they all did experience the pain of divorce and separation.
Wait a sec.....are marrying the guy that gave you crotch-rot and is lazy and cruel? If so...you have more problems than him finding out you banged an ex.
The red eye is a normal reflection of the flash off the retina. White eye means that the light didn't reflect off the retina. If it's only one photo, and it's not the most recent one, don't worry. If is showing up now, get an eye exam to rule out any problems.
I grew up in a hunting family, and we're a hunting family even now. We keep the ammo locked up separately from the guns, and did when I was a child. My parents wouldn't have killed each other though...they had too much fun verbally tormenting and abusing each other and wouldn't have wanted...