Deuteronomy 25:11-12 says "This is what you must do when two men are fighting and the wife of one of them comes to rescue her husband from the man who is beating him. If she tries to stop the fight by grabbing the other man's genitals, cut off her hand. Have no pity on her."
Does it make a difference about touching? My girlfriend is becoming a nurse and it really bothers me!
This is not the type of touching referred to in "Now concerning the things of which you wrote to me: It is good for a man not to touch a woman" (I Corinthians 7:1). The touching discussed in I Corinthians 7:1 is regarding touching for sexual arousal.
The law is equivalent to the law where a pregnant woman ends up getting injured when two men are fighting. "If men fight, and hurt a woman with child, so that she gives birth prematurely, yet no harm follows, he shall surely be punished accordingly as the woman's husband imposes on him; and he shall pay as the judges determine. But if any harm follows, then you shall give life for life, eye for eye, tooth for tooth, hand for hand, foot for foot, burn for burn, wound for wound, stripe for stripe" (Exodus 21:22-25). If no direct harm is done to the woman or child, then the man is fined. But if harm is done and the man is found guilty, then the same damage is inflicted on the man.
In the case of Deuteronomy 25:11-12, a similar thing happens, not with a child but in this case a man's ability to have children in the future. The word chazaq, translated as "grab," implies much more than a touch. It means a strong, firm hold -- in other words, she squeezes and crushes his testicles. She has done damage to the man. Normally the judgment in a fight is that the one causing damage receives the same damage in return, but that is not possible since a female doesn't have testicles. Also a part of the damage is not definable because we are talking about the potential loss of future children. Thus, the penalty if a judge finds her guilty is the loss of a hand. Secondary facts, such as that she was defending her husband, are not to be considered in the punishment given.
Again, this law has nothing to do with someone giving medical aid that might require the touching of a male's genitals.