Answer: Family history of the disease
Explanation: Osteoporosis is passed on from generation due to its strong genetic component!
A short term goal would be to abstain from sex or masturbation for a health reason: waiting for a UTI, STD or other issue (from a procedure, perhaps) until healing comes.
A long term goal would be waiting for marriage to have sex and then committing to only have sex with that person.
The answer is B, since the question is asking for complete agreement between the partners.