I just got back from my Dojang this evening, and for what it's worth from another martial artist, lemme say... WHAT JERKS!

It's your partner's responsibility to watch your back in training, make sure you have the space you need. Particularly when you're Uke (to use the Japanese term) and receiving his technique.

I would call this abusive behavior, sexual or not. The person in power has once again done wrong, and tried to make you the receptacle of their blame.

But it is THEIR blame. By the rules of every mat I've ever stepped onto, it's their fault.

It's not your fault.
It's their shame.
Their dishonor.

Your compassion, sensitivity to the fellow student's pain, and your caring heart are your strengths, your victories.

You wouldn't stand in the way of a charge, you'd get off the line. May you find the strength to get off the line / out of the way. Don't own it. It's totally not yours.
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We are not defined by our faults, or our wounds, but by the truth within us, which nothing can take away.