Ahh, but when he first met Teyla, she had the wig of horror, and when he first met Ronon he was all smudged, and we know first impressions are everything for John! (it wasn't the hotness, see, it was the makeup that did it...!)

...I maintain that he wasn't surprised, just worried that Major Teldy was going to run afoul of DADT, as she wasn't exactly being subtle about her predilections XP