Flip Flop - I have a lot to say on this subject so bear with me.
First, are you on any kind of hormonal birth control? When I went off mine I found my sex drive to be significantly more... active. Particularly in the first half of the month. While birth control doesn't reliably affect sex drive person to person, it CAN be a factor, and there are definitely options you can try that are either more localized, or don't involve hormones at all. And sometimes a particular formula won't affect you as much. Also other drugs that affect sex drive. When I was on an anti-depressant briefly, I basically stopped being interested entirely. If such is your goal, you could consider discussing with your doctor any medication changes to get you interested more often.
Second, when I rejected my husband, he would often get mopey and stop cuddling/touching me, all the while saying it was my choice. So his actions didn't follow his words and I often felt unhappy and stigmatized by his subsequent rejection of me. Other times I would agree to sex just to make him happy, but if he asked for it too often I ended up feeling used. In the long run this made sex an uncomfortable subject for me. Don't get caught in this trap. Yes, it's a delicate balance, but you need to balance YOUR needs as well as HIS. I'd recommend communicating more on the topic.
Third, there are definitely things you can do to stimulate your own sex drive that have nothing to do with your medication levels. The mention of lingerie can help. Making a list of things (kinks) you'd like to try can help as well. While some have issues with the morality of it all, I don't, so I'll suggest reading or watching pornographic material sometimes, so long as your husband doesn't have an issue with you viewing it. (Some folks consider porn cheating. I don't really understand it.) One thing to remember however is that any activity you try needs the green light from BOTH of you. For example, for awhile my husband was pressuring me to try a threesome with me. I'm bisexual, but ALSO decidedly monogamous, so this wasn't a go for me. But he seemed to behave as if our sex life would die if we didn't try it. So I tried to go along. (No we didn't proceed to end-game, luckily.) Lesson to learn here: Do not waver here. Nobody is going to be happy if you do.
Fourth, your interest in flirting with other men is tricky. There's nothing inherently wrong with this urge. You say it's a turn on for you. Perhaps you should discuss this with your husband, as you might (personality dependent) be able to work with this. Your husband may be willing or interested in exploring this with you. Definitely do NOT proceed without the green light from him.