It is neither, healthy or unhealty. I know plenty of girls enjoy doing it, and even more men enjoy having it done! No need to worry!
It's not healthy, but it won't harm her. What's contained in sperm isn't going to be enough to do anything for her body. If she needs protein (or whatever) she needs to get it from her actual diet.
please help me my girlfriend likes swallow my semem 3 o times a week i just want to now if is healty for her?? cause some doctor tell me when the girls doing exercise the men semen works good on the womens grow mass on her cause is o lot proteine is that true???