He trusted Zoro's stamina.
How did he "sexually violate" Nami? (Law body switch doesn't count fully as that was his body at the time, so he wasn't touching Nami's consciousness) Applying real world logic to this is just sad, her punching the crew is domestic violence and she should be in jail too by those standards.
Luffy didn't guard himself and was warned, Sanji tried to cut ties as strongly as possible to save Luffy and Zeff from Big Mom, this is quite clear...
Can you post the ch number for the kids thing, he was probably being tsundere, he even made sure all the marines survived vergo and the poison cloud when he didn't need to after all...