When are you due?
Does your husband find you attractive while your pregnant?
Why do you feel insecure?
If we could figure out why pregnant women have the feelings they do then we could both be millionaires! lol. If you don't feel like it, then you just don't feel like it. You can't force your body to do what it doesn't want to do. Perhaps your hormones are down, and you just don't feel it. Perhaps a part of you is resentful towards him.
Now that's not to say that you can't try. Your husband sounds very understanding and very sweet. Let him know that you want to try, but that it might now work, so he doesn't make you feel pressured. Set up a romantic evening, whatever it does that makes you feel romantic, slow music, dim lights, and have your husband give you a full body massage. Or you can sit/lay and cuddle on the bed or the couch and just enjoy being with one another and talking.
Remember that you have nothing to be insecure about and that your hormones can make you feel this way. Make sure someone is watching the twins so that you can feel like you are free to be yourselves and not worry about them. It's just as important to touch, cuddle, caress and give each other love as it is to make love.
I welcome your thoughts, let me know if you want to talk more
He sounds very understanding, and if you bring up the subject with him, I'm sure that he would have no problem working it out with you. Are you afraid that it will hurt the baby (it won't as long as you haven't lost your mucus plug or are dilated at all), are you afraid you won't be good? He's not going to expect gymnastics at this stage of the game. Take a look at this link that talks about sexual positions during pregnancy and see if it helps at all. If you want to talk more, I'm here
You're very welcome. I thought he would be ok with this. It's good to know our lucky, and I bet he feels the same way about you. I'm here anytime you want to talk, you can always request me by name, and I am at your service (smile)
Best of luck with the birth.
ps, please remember to click the green accept button so I can get credit for my work with you.