Bondage: This could range from light to very extreme.  The milder forms include anything from handcuffs to tying the wrists and ankles together or creating a "spread eagle" effect by extending the ropes from the four corners of the bed.  If your partner agrees to mild bondage, be sure not to loop the actual rope around his/her hands and feet.  Either use small pet collars or purchase a kit for this purpose from an adult novelty shop.  The more extreme form of bondage uses mouth gags, head masks, collars, nipple clamps, chains, ceiling hooks, whips, and several other items we are not able to mention here.  Again, be sure that your partner is clearly accepting of any of these practices.  Anyone who inflicts bondage upon an unwilling lover is no lover at all.  Inflicting pain on one's lover is not an act of love.  Bondage is not pain--but restraint.  If that turns both of you on, then fine.  If not, avoid this one altogether.
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Cross-dressing:  This involves role reversal and is enjoyed by those who practice it.  The clothing of the opposite sex, usually lingerie for the male, with the female taking on the dominant role is the common scenario.  Again, a mutual agreement to introduce this into your lovemaking practices is necessary.  There are also some very mild variations of this that would be more acceptable to most.
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Dirty Talking:  To some, this is a real turn on when certain words trigger a sense of erotica.  To others, it can have the exact opposite affect and be a complete turn off.  Whatever you do, be sure not to use words that are demeaning or insulting.  The idea here is to stimulate and intensify the experience--not to belittle the one you love.
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Fetishes:  Sex practices based on specific parts of the human anatomy or female attire are common.  The list would include breasts, legs, feet, nylons, rubber wear, leather, etc.  In fact, there are too many to name here just as there are anotomical parts on a human being.  For example, some men are really drawn to a woman's feet.  As long as it results in gentle touching,  stimulating carresses, as well as his wanting to purchase feminine footwear (e.g. 5" spiked heels, etc.) for her, then it can be mutually enjoyable.  This kind of thing is for those who have a specific focus and, again, should be pleasurable for both of you.  Again, the idea of agreement between the two of you when practicing any fetish should be decided on before doing so.
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Sadomasachism:  This involves inflicting some kind of pain on a submissive partner.  It can involve using a small whip to gently slap the body, producing sexual arrousal, or can involve some extremely violent acts.  If one's partner is not agreeable to this, it should not be considered any further.  If you do practice it, the term "safe sex" takes on another meaning and you would do well to be extremely careful.  This is practiced by a very small minority of people with most of our population considering it to be too extreme.  The results can be tragic.  Couples should not enter into this kind of thing without being extremely cautious.  Not only that, but this is definitely one area of human fetish practice that can spell a great deal of trouble (including legal and criminal) if not practiced safely and with both people in total agreement as to what is to be done and not done.  In fact, avoid it.  The implications involved in the more hardcore type of Sadomasochism may be disasterous.
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Threesomes:  Inviting a third person, male or female, to take part in lovemaking necessitates that either you or your partner be bi-sexual.  To some, this form of sex is acceptable.  The greatest risk here is that either partner might find themselves desiring the third person more often without informing their mate.  This practice is usually considered to be unacceptable by those who adhere to manogomy.  Again, be sure that all parties are agreeable and that there is a risk of someone being eventually left out in the cold.  Relationships are difficult enough for two people, let alone three to share together.
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Sexual Aids:  Adult erotic toys are definitely a matter of preference.  They come in all different forms.  Toys can be obtained either through Internet resources or from a local adult novelty shop.  In recent years, a new kind of adult store has begun to replace the slinky men-only haunts of the past.  Due to the video revolution, peep shows that once drew all kinds of men to strips of adult book stores have closed and are being replaced with a smarter kind of store that features risque lingerie, sex toys, and other related intimate products, etc.  Due to this change, women are now venturing in to these businesses to take advantage of the various products that are offered for sale.  In fact, couples are now enjoying visiting such shops together to pick out items that they would both enjoy together.