I've been married for 15 years and have had 5 kids with my wife. As for impregnating her, I focused more on her the whole time and how it felt to connect with her on an intimate level. I also really didn't understand my dysphoria until this past year, so it was easier to hold my discomfort and depression in the back of my mind. I felt a connection with those who pursued transition, when I saw stories of transgender women on TV as a kid. I thought that if I could magically wake up with female genitalia, I would be happy. To add onto that, my family was pretty conservative in regards to sex and gender roles, so I felt the sting of shame for the way I felt from the age of 5.
I married my wife right after high school, at the age of 18, and then I went into the Air Force the same year. With little time and energy to focus on anything but training and getting to my first duty station without failure, it was pretty easy not to let my dysphoria get to me (though, I really didn't know why I felt like I did, then). Once I began having kids with my wife, I focused more on the well-being of my wife and kids. To add to the factors that, I felt, kept me from revealing my trans identity, there was the "don't ask, don't tell" policy in effect and I worked in a maintenance career field. Maintenance is very non-politically correct and they speak their minds without filter. It's not hard to overhear the intolerance that surrounds you, so, not coming out became the rule for my survival, not the exception.
Of course, after I came out to my wife, she felt like she was lied to and that I stole a big part of her life. I can't blame her for that. Though she still feels that way, she is still as supportive as she can withstand. She cares about me, but she's still feeling the hurt. It almost makes me want to not pursue transition so as to be the man that she wants in her life. I just can't see myself surviving the deep depression and discomfort for the rest of my life.
TL;DR - I focused more on connecting with my wife and having kids with her, rather than the act of coitus, itself. While I enjoyed the feeling, I more wanted to be as close as possible to her.