One suggestion is that you might consult the Kama Sutra¹ for a better position that places less stress upon your hips, or on whichever "sensitive" part next presents itself. The experimental approach to finding a "new way" can be a lot of fun, and for some of the positions the giggles will probably cover the "scrumps."

¹ As a reference manual, the KS is much over-rated; but there are any number of quite good modern manuals in back corners of the book shops.

My experience has been that the young ladies at the checkout counter are able to suppress their snickers until you're out of earshot - unless you're s.o.o.o.o. old that they find your interest inconcievable. (You're welcome to use my "it's a stag party gift for a nephew.")

John