Says he's too busy/tired for sex

I'm 27, in a semi long distance relationship (half the year I live and work away) and the half of the year where I'm working away is coming up. I've spent over 3 weeks now practically begging my partner for sex, but he ALWAYS says he's too tired, or too busy, or sore, or the one that insults me the most, that he isn't willing to spend the time and energy having sex with me when he could be putting it to working, a profitable use.

I am a VERY sexual woman and sex is a large part of how I bond and show love to my partner and I'm going a little crazy without more than just occasional kisses throughout the day. We haven't even made out in over a month. Our sex life used to be hot and heavy, kinky and fun, now it's all but disappeared. Other than for this though, he's attentive to my moods, we still cuddle and share intimate moments and I love him more lately than I ever had.

Should I just suck it up and let my hard working man concentrate on a spring workload or should I really make a fuss about it? I feel like each sexless day is a lost precious opportunity. What do you ladies do to distract yourselves if all you can think about is sex?