The shaving of the genital hair (can be mortally sinful or non-sinful depending on the reason why it is done). If it’s done with the intention of enhancing sexual pleasure and/or for seeing more of the spouse, it is always a mortal sin.
Inappropriate sexual position. This is often a sign of passion according to St. Thomas Aquinas, and if so, it is a mortal sin. (See next section for appropriate sexual position according to the teaching of the Church.)
Aphrodisiacs or substances used to enhance lust. If the intention of the spouses when using aphrodisiacs is the enhancement of their shameful and damnable lust, they are absolutely committing a mortal sin. The only exception to this that is absolutely necessary would be if a husband couldn’t achieve an erection and so took a substance that helped him achieve this end. In this case it wouldn’t even be a venial sin since his intention for using it is not to increase his pleasure, but rather to conceive children and fulfilling the marital duty. However, a husband must never use pills or compounds that he knows will increase his lust. There are many pills and natural herbs that can be used to achieve an erection without necessarily increasing the pleasure (such as PDE-5 inhibitors). Erection first and foremost has to do with blood-flow, and so that is what should be looked for in herbs, medicines and supplements.
