That reminds me about the young university student doing her thesis on contraception in low socioeconomic areas.

She did a survey on peoples methods of contraception.

She was knocking doors and asking the women of the household their method of contraception.

All was going well, The usual methods. Withdrawal for  some ladies, Oral pill for some, Prophylactics for others. diaphram and coils for some.

Then one house this rather large lady answered the door and was asked what method she preferred for contraception.

Oh I use the biscuit tin. Oh said the student, I've never heard of that method.

Well said the woman, my husband is a little guy so when we make out he stands on a biscuit tin.

Just before he climaxes I kick the tin out from under him.

I hope I haven't offended anyone.