1. The anabolic testosterone is a key factor in muscle development and bone density. While there is enough variety that on both ends of the spectrum, there is some overlap between males and females, on average men have ten times as much testosterone as women. Women are weaker on average. This is why sports events seperate by gender.
2. The myth about a higher pain threshold of women is based on observations of women during childbirth. However, it's now well known that during this time their body pumps out different chemicals. This increases their pain threshold during this time. From an abstract, "There was a significant decline in pain threshold after labor as compared to pain threshold during labor [...] Pain intensity using the VRS score was higher during labor than before labor [...] We found a significant rise in pain threshold during labor in term pregnancies." In fact, with the exception of pregnancy, it is men who have a slightly higher pain threshold.
Sorry but go through basic training a long side women and try and come back with that crap again. Women can be just as strong as men, not everything is found in books look to the real world. And on pain threshold, yes women do have a higher pain threshold, the books actually back me up on this one as they have a huge amount of endorphins through virtually any situation when most mens bodies would go into shock and shut down.
Sorry but I've gone through actual basic training in an actual army, you can come back after you've done 3 years service in an actual army. Meaning Marines or better.