It's funny - I've had this conversation with many people over the years I've been playing. Now for many the belief it that I picked up the guitar as a way to get girls or because it is supposedly some phallic symbol. I've heard these thoughts reinforced many times by observers, other musicians etc.
However for me that was never the reason in my head and I never make the association with the sex thing that many seem to. When I was very little I was obsessed with music, my Mum had one of those huge stereograms that people used to have in the 60s - I just remember that replacing our old Danset record player.
Here's a similar type one...
Eventually this ended up in my bedroom whilst I was in 6th form / college before I replaced it with a music center I bought off my wife's brother not long before he passed away.
Anyway back to the point... I used to stand in front of this loaded with 45s that were on the spindle and crashed on to the deck to play... remember that - playlists aren't new you know just the technology has changed :-) My Mum had a good collection of music, Elvis, The Beatles, Shadows, Herb Albert etc. I had a little old metal toy guitar that I used to stand and mime with "playing along". I honestly can't remember when I didn't do that. By junior school I was into anything music, learning the recorder and in the choir etc. so I could read music etc.
I then went to grammar school and again was straight into the choir and then into the orchestra playing the oboe - I've no idea why but I wanted the oboe. I think I'd heard that was the instrument all others tuned to in an orchestra therefore it must be the best I thought! Also then my Mum got me a cheap Spanish guitar and started to learn in a group lesson but didn't get on, soon Mum found a young lady who taught classical guitar and I took off with that. A year later the first electric arrived and bands started.
However in all this - it was the music, making music, writing my own music that was always the driver and the interest for me. Frankly I never considered being a musician and a guitarist would "get me the girls" or was some form of public masturbation. However I did meet my wife through music connections - she'd been in a show that my mate had played drums for and she came to see a big band jazz band we were both in and he introduced me to her. She then came along to one of our rock band rehearsals and the rest is history as they say. But I don't think the guitar had any appeal to her in any way.