Staying in the same tense is something I find really confusing about writing. My book is past tense, in general, but there are times I find using past tense feels wrong. I'll give an example. Women were complicated creatures. Some girls, like Jess, were like a serious of locked gates which only needed to be opened once. The moment he and Jess had shared their first kiss, the gate was unlocked and he felt completely free to lay one on her any time he pleased. But girls like Cora were more like a top secret military base. A soldier might be allowed inside when it served a purpose, but couldn’t simply return the next day and walk back in. Not without clearance. I'm debating whether to say "Women were complicated creatures" to keep with the tense of the paragraph, or to say "Women are complicated creatures". To me, women being complicated is a fact that transcends time, so wouldn't it be present tense? There are a lot of these little facts/thoughts throughout my book that seem separate from any certain tense. This is confusing to me. Any insight would be helpful.