Martin "Slam Bam Thankyou Mam" Gibson delights in offending people, primarily through offering up his adolescent view of sex between individuals. He cuts a wide swath and trashes a lot of good conversations in the process. He assumes this offensive stance armed with an apparently incomplete sexual education.

According to many sources regarding homosexual sex versus anal sex (here is one):

Who does it?
There is a common misconception that anal sex is practised almost exclusively by gay men. This is certainly not the case. An estimated one third of gay couples do not include anal intercourse in their lovemaking with about one third of heterosexual couples doing so from time to time. About 10 per cent of heterosexual couples have anal intercourse as a regular feature of their lovemaking. In absolute numbers, more heterosexual couples have anal sex than homosexual couples.

Is it safe?
Anal sex, if practised with care, is possible for most couples. It does, however, carry additional health risks and there are safer sexual practices that couples can enjoy. The main health risks, which affect both heterosexual and homosexual couples, are described below. . .