That just seems like poor science, they studied 16 students and seemingly haven't given much thought to other factors. However I could agree with their theory behind it yet I don't think the vaginal orgasmic history would directly affect walking or be a predominant factor in how you walk (mechanically speaking) - bar rough sex, but the walking is pretty the next day. I agree with the last note, it's more psychological:
Laura Bermann, writing in Chicago Sun-Times, raises an interesting question on the relationship between a woman's gait and sexual function with the question: Which came first, a woman’s sensual, free walk, or her habit of reaching vaginal orgasm?
She states her opinion on the question:
"I think the former. A woman who walks with confidence, ease and a bit of sex appeal is likely more in tune with her sexual needs and her body, meaning that reaching vaginal orgasm is easier for her than for someone who might be more self-conscious and inhibited as she walks down the street. A woman who isn’t comfortable in her own skin outside the bedroom isn’t likely to be comfortable in the bedroom. She will likely be more inhibited and disassociated from her physical sensations during sex, all of which will complicate the process of attaining vaginal orgasm (which is notoriously harder to reach than ****oral orgasm for most women). "
Read more:
http://www.digitaljournal.com/article/313408#ixzz1c5d4NFjY