Andrew Dalton complains (SMH Letters Aug 18) that images of sexual arousal are considered confronting, suggesting that this is because people think the act itself may be pornographic. But many things are perfectly natural, and we still think they should be kept private. Things like public defecation and urination, nose picking, groin scratching and vomiting come to mind. People may well have no problem with such behaviour, but they recognize it doesn't belong everywhere.
Sex is given by God for the strengthening of relationship. However ubiquitous displays of overt sexuality in public advertising, the internet, and in reading material encourage people to look to somewhere other than their spouse for sexual satisfaction. This is not good, and people are right to protest against it.
The letter it's responding to is here.