Dude, since Allen is an OC, technically all of this is headcanon.
1) What attracts him most to women is intensity, drive, and badassness in some field. His first childhood crush was on Xena, his college girlfriend made business and law her bitch, and he had a huge thing for his evil boss due to her intense scientific skills and drive. The woman he eventually married was determined from childhood to become a cop, right wrongs, triumph over evil, and in the process ended up resembling his first crush more than she ever suspected she would. While he's not one to put on a pair of blinders for a wet t-shirt contest, what keeps him coming back is intensity in some form or other.
2) He graduated high school at age 12. He obtained his first Bachelors' at age 15, his Masters at 17, and immediately began his quest for PHD candidacy while taking on a prestigious engineering job at 18 - and this was all before half his brain was a computer.
3) His mom sort of left when he was 6. By "sort of" I mean she realized she wasn't happy in her marriage, divorced his father, and moved to the other side of the country to follow the hippie art circuit. She left Allen in his father's custody because she acknowledged that a stationary, stable life would probably be better for a child genius, but kept the baby when she became pregnant a year later. Intellectually, Allen is not confused about this scenario, but it bothered him for a while.
4) Flakiness is his least favorite feature in any sort of person. He's forgiven his mom for it, and loves her, but isn't sure he likes her very much.
5) He has two half siblings - Amy on his mom's side, and Daniel on his dad's side. Daniel, his younger brother from his dad's second marriage, is 19 and wants to be a doctor. Amy is 23 and to be honest, I have no idea what she does. Maybe she doesn't either.
6) Allen broke the geek stigma by being something (only something) of a ladies' man in his late teens. He would visit his friends at their schools or universities, pose as a student from whichever school he wasn't at, and rope smart girls into tutoring him in subjects he already knew. By the time they saw through the lie, he would have already figured out their interests and how to hook them with information he'd learned from scientific papers on relationship psychology (screw Cosmo).
7) He's adventurous now, but spent his childhood being a basement dweller, apart from a few months of traveling with his mother and camping trips with his dad. He was always interested in the notion of adventure, but his focus on knocking education out of the way kept that something to do "later" until the point in his life where "later" became "now." Which it did.
8) He's been shooting since age 10 - under careful supervision of his cop father.
9) He always wanted to learn how to pilot a helicopter.
10) His favorite smell is bergamot. He doesn't know why, but doesn't really care.
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1) What attracts him most to women is intensity, drive, and badassness in some field. His first childhood crush was on Xena, his college girlfriend made business and law her bitch, and he had a huge thing for his evil boss due to her intense scientific skills and drive. The woman he eventually married was determined from childhood to become a cop, right wrongs, triumph over evil, and in the process ended up resembling his first crush more than she ever suspected she would. While he's not one to put on a pair of blinders for a wet t-shirt contest, what keeps him coming back is intensity in some form or other.
2) He graduated high school at age 12. He obtained his first Bachelors' at age 15, his Masters at 17, and immediately began his quest for PHD candidacy while taking on a prestigious engineering job at 18 - and this was all before half his brain was a computer.
3) His mom sort of left when he was 6. By "sort of" I mean she realized she wasn't happy in her marriage, divorced his father, and moved to the other side of the country to follow the hippie art circuit. She left Allen in his father's custody because she acknowledged that a stationary, stable life would probably be better for a child genius, but kept the baby when she became pregnant a year later. Intellectually, Allen is not confused about this scenario, but it bothered him for a while.
4) Flakiness is his least favorite feature in any sort of person. He's forgiven his mom for it, and loves her, but isn't sure he likes her very much.
5) He has two half siblings - Amy on his mom's side, and Daniel on his dad's side. Daniel, his younger brother from his dad's second marriage, is 19 and wants to be a doctor. Amy is 23 and to be honest, I have no idea what she does. Maybe she doesn't either.
6) Allen broke the geek stigma by being something (only something) of a ladies' man in his late teens. He would visit his friends at their schools or universities, pose as a student from whichever school he wasn't at, and rope smart girls into tutoring him in subjects he already knew. By the time they saw through the lie, he would have already figured out their interests and how to hook them with information he'd learned from scientific papers on relationship psychology (screw Cosmo).
7) He's adventurous now, but spent his childhood being a basement dweller, apart from a few months of traveling with his mother and camping trips with his dad. He was always interested in the notion of adventure, but his focus on knocking education out of the way kept that something to do "later" until the point in his life where "later" became "now." Which it did.
8) He's been shooting since age 10 - under careful supervision of his cop father.
9) He always wanted to learn how to pilot a helicopter.
10) His favorite smell is bergamot. He doesn't know why, but doesn't really care.