I actually hate how my boobs are emphasized when I carry my bag this way. Friends comment a lot and maconscious sad ko naay mga maniac magcge pamantay.
But I can't help it. If you place the strap on the shoulder with the bag on the same side of your body, it usually slides or falls off. So people tend to place the strap diagonally. It's not anyone's intention to emphasize the boobs. It's just more convenient to bring shoulder bags that way for various reasons.
1) It's more secure and convenient.
2) You can use both hands for other items and doing other things without worrying about the bag falling off.
- Usually, if you place your bag and strap on the same side, you'd still have to use the hand on the same side to secure the bag to either keep it off from falling or protect it from being snatched.
3) Big bags cover one of your pant's pockets.