Because the idea is to avoid the routine try to avoid the usual place for sex. Don't be in a hurry! Talk to your boyfriend to relax first and spoil each other.
Most people who have been in long term monogamous relationships experience a feeling of being stuck at one point or another. For some it's a steep or gradual decline in sexual activity, for others it's a feeling a boredom after doing the same thing over and over again.
The lotions and body oil can be a big help to turn on your man by offering him a long massage.
The most important ingredients are imagination, fantasy and love. If you are tired, you are unlikely to have much strength left for sex - whether you are a man or a woman. When a job is very stressful, the effect of that stress will be to diminish the amount of energy you have for sex. You may be so stressed out, you don't even think of sex for quite long periods. The first thing you can do is to be honest with your partner.
It may not be ideal to only have sex at the weekends or during holidays, but at least if both parties know this, there will be fewer unrealised expectations and fewer quarrels. In other words, the relationship should become more relaxed.
