Aromas may increase the sexual desire and joy in majority of couples. However, they are not a must. Bad body odour may turn off one of the partners. Jasmine, rose etc are believed to be good aphrodisiacs. Different individuals find different aromas stimulating. One can arrive at the aroma of their choice by trial and error.
The best stimulation process is through talk and fingers. Open discussion may help both the partners. Loyalty and comfort may be welcome addition. Fear of sexual intercourse, fear of pregnancy, and pain during intercourse are just some of the topics that may need frank discussion.
In humans, the male is the active partner and in a conservative society like ours, he may need to be the first mover. A slight push may help her in opening up in future.