TL;DR: Track your LTR's period cycles if you're in an LTR or even otherwise - it helps understand emotions.

Body: So I got some advice from here about five months ago on tracking period cycles in order to know behaviour from women during the month. Quickly downloaded an app (which was free and there are about a dozen available) and started making notes each time of the month. What I've found is actually quite stunning to me that I didn't know it before and also very interesting.

I am currently dating a woman who is my main plate (I have two others) - she wanted to be an LTR but I found out about two months in that she was dating other guys and hiding it from me, therefore automatic demotion. She claimed to love me, etc but then would go out with other guys behind my back. She has not slept with anyone else THAT I KNOW OF. However, her monthly cycle has given me amazing insight into not only when she is going to be horny, but also when she is going to be hypergamous and more likely to flirt/go out with other guys.

Since February, consistently immediately after finishing her period she gets very horny and will do much sluttier things for me. Anal, dressing up, we even did it outdoors in a public park in April. Then about 8-10 days after her period ends she gets withdrawn, emotional and almost depressed. Ovulation (again, for her) typically starts about 2-3 days after this - and she's happy again, horny and wants more sex. I'm going through this phase right now and Sunday night she woke me up twice in the middle of the night for sex after already getting it twice before we went to sleep. Three days ago she was strange, emotional and withdrawn - again, this is part of the pattern.

However, this is also the time typically where I will find flirty messages with other guys, sometimes inappropriate things spoken about (ie if I was in an LTR with her talking about sex with other guys - to other guys - is an absolute deal breaker). Then she gets back to "normal" and about ten days later her period starts. Case in point, Sunday night as I said she wanted four rounds of sex and two in the middle of the night, but I also found a message on Facebook between her and some other guy she obviously knows from her past that was pretty sexual. In March and April both times she went on dates with other guys was during this stage. She typically goes out with them for dinner or drinks, comes over to my place and fucks me silly - not knowing that I know where she was.

My point is that this has been consistent over a four month period. Period, right after she's horny like crazy, 8-10 days later sullen and withdrawn and depressed, 2-3 days after that she's ovulating and going crazy for me and other guys and then cycle repeats. Tracking this has given me new insight into when I can expect more shit tests (typically in her hypergamous period when she's just about to ovulate), comfort tests (during and after her period) and when she is likely to exhibit cheating type behaviour.

Lessons Learned: Tracking this has helped me understand WHY she does certain things. Remember that this is hormone driven and all women are susceptible to this. As a tool for managing your relationship you can use this very effectively without her having any idea and manipulate your own behaviour in order to keep things sane and get more sex during certain times of the month if you play your cards right.

Hope it helps those of you in LTR's and part of married red pill. I wish I'd known about this when I was married.