OMG that really grosses me out- the whole promising daddy that you will wear his ring and not have sex just is SO weird! I wouldn't really be crazy about my 19 year old getting a pre-engagement ring either, at 19 I hope she is living life to the fullest and having fun and not pinned down to one boyfriend who gives her a ring to show everyone else that she is "his"
I agree! I don't think fathers should be trying to control their daughters' sex lives. Definitely gross!
With regards to living life to the fullest, though...
At 19, my university roommate was "living life to the fullest" by sleeping with three different guys, and spending her evenings going clubbing and experimenting with pot. What she was doing didn't look like a very good idea to me, but she seemed happy enough. And ultimately, nothing terribly bad happened to her (she graduated, got a job, moved on with one of the three, etc).
At 19, I'd just met the man who would eventually become my husband. He was my first serious boyfriend, the first and only man I was ever intimate with. By 20, I was quite happy to be "pinned down to one boyfriend" and by 21 we actually got ourselves handfasted in a Wiccan ceremony (we weren't Wiccan, but many of our friends were), symbolizing in front of everyone that we were committing to be a couple for the next twelve months (so, kind of like the pagan-party-version of a promise ring). 22, we moved in together and I got engaged to him, and he gave me a ring. 23, I married him, and he gave me another ring. Did I live life to the fullest? I feel like I did, and I certainly had a lot of fun along the way, even though I didn't party or play the field like my room mate did.
At 20, we joke that my daughter is "married to Science". She says she doesn't have time or interest in having a lover in her life. She spends almost all of her time in the lab, studying, or playing logic puzzles online. Is she living life to the fullest? My old room mate probably wouldn't think so, but I've never seen my daughter happier or more confident about what she's doing with her life.
Everyone follows their own path. I don't see any reason why a pre-engagement ring has to get in the way of anyone living life to the fullest and having fun. If my daughter had got one at 19, I'd have had complete faith in her ability to make her own choices.