If you can recommend me only one book, what would it be?

Basically i want to know your all time favourite book and why you chose it. If you want to recommend series that’s okay too, but only one.

I’m kind of new in sci-fi romance and tried only 5 or 6 series, and i would recommend {ice planet barbarians by ruby dixon}. ( even with my limited experience ir was already hard to choose). I was sceptical when i started it but it sucked me in until i was dome with the series. What i liked is that there are different personalities both for mmc and fmc, and their chemistry worked for me. Plot wise it’s okay, there were only a few moments (and they were minor) that seemed a bit ridiculous. It was easy read, while there was some drama it wasn’t heavy (except in the beginning of the first book), the characters had issues, some depth. Romance and sex pace for every character made sense for me too. And, there are some virgin characters, but also some not so shy and more bold and experienced.