>>15490067as a man who has had many women in my late teens into late twenties. i can tell you my anecdotal experience.
personally i don't think casual sex "devalues" romantic bonds. but rather it shows YOU, who you are, what you like and reveals your shortcomings as well as triumphs. i don't mean to make this sound for more than what it is so putting it simply.
the more sex you have, the more experience you have, the more you learn. this newfound experience and knowledge isn't limited just to the sexual aspect but also to the romantic relationship aspect. because you need to get to know someone before you fuck them. you need to know them very well before you fuck them silly. and knowing different people intimately affects you, by teaching you there are different kinds of people out there whom you may or may not enjoy. and have traits you may or may not enjoy.
the way this comes back to your own personality traits to bite you in the ass. is that, when you fall in love with someone and you have had a lot of partners in the past, you kind of know what's out there already and if your current love interest fails to meet your expectations you may end up revealing your own shortcoming by quitting the relationship, or reveal your strength by sticking to it. the knowledge of others, the knowledge of the potential can be a burden to someone especially if they are unsatisfied and especially if they think they know they can get what they are missing elsewhere.
take it this way, if you are someone who regularly enjoys high quality perfectly cooked steaks. I would assume you know what to look for in an amazing steak. so when you go out and someone serves you a decent sirloin with a side of baked potato, you may enjoy it..hell you might even like it. but you will always know what a perfect steak is. so it will come down to your character of will you keep eating at the sirloin place because it's good enough, or will you leave them to find the perfect steak.