Robin, this is just my opinion and the environment I try to create in my school. What I said before still applies and this situation should probably be taken up with your teacher if you are that uncomfortable with it and let her/him correct anything he feels is wrong.
Having said that, I try to create a somewhat genderless atmosphere. I pay attention to specific areas of both anatomies that go on the list of 'don't hit hard'. Eyes, Throat, Ear(drums), spine, sides of knee, bladder, spleen, kidneys, groin(both genders), lower abdominal area on women. I talk to women about the fact that it is going to be very difficult to not get hit in the chest and recommend a women's chest protector. Every woman I know who has tried one on has said they would rather occasionally get hit in the chest than wear one to spar. If they are over 18 that is their choice. I've never met a woman who has tried on one of the women's groin protectors.
I tell all my students that we are here to explore the martial arts and that there will be a lot of physical contact to personal areas of the body but that I expect everyone to be adults and very matter of fact about it. I let them know that I am going to be very matter of fact but not crude in talking about the body. If I am working with a new female student I let her know when I am about to touch or grab her waist or hips but after she as been there awhile I don't feel a need to if she gotten comfortable with me. I am just adjusting her the same way I adjust any of the male students. My limited experience is that it is very hard to get male students to forget that they are working with a female and do what they are training to do and not worry about it. My girlfriend is training with me and she and a male student started about the same time and have been steady training partners and she told me he kept freaking out and apologizing profusely everytime he came in contact with her chest. She had to keep telling him that it was ok and they would not be able to train the way they were supposed to be if he kept wigging out ever time he touched her 'teat' (her words) I think he freaked out when she said that too. But, he's gotten over it.
It sounds like you maybe suspect that there is some other intent from your fellow students. If so, talk to your teacher. If something else is going on he neads to have a discussion with his boys. If nothing else is going on besides training then you might need to figure out why you feel wierd about it.
again, just my .02, good luck.
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It's simpler than you think.
I could be completely wrong"