One of the true masters of the pants role is Brigitte Fassbaender. Her Hansel is a true marvel and I'd suggest watching the entire production, but watch the opening scene here. Pay close attention to how she sits and her emotive gestures.
Below is a clip of Susan Graham's Cherubino. It's amazing how she comes off as young yet manages to create this incredible sexual tension. However, I should note that the way that Cherubino treats Susanna is NOT how the average male treats a woman; this is particular to Cherubino and his situation.
More coming soon!